There are six Star Wars-movies, which tells different stories from the SW-universe somehow linked to each other. But there seems to be a whole lot more, can anyone tell me where I can find more SW?

Besides Episodes I through VI there is...

1. The new (and totally awesome) Clone Wars animated movie and TV series:
Film: link
TV Show: link)

2. The vast collection of novels:
link

3. The equally vast array of comics:
link

4. The huge list of Star Wars games, many of which contain new storylines:
link

5. The online comic, partner to the new TV show:
link

6. The old Clone Wars animated show:
link

7. Ewoks: The Battle for Endor, a 1985 made-for-TV film:
link

8. Star Wars: Droids—The Adventures of R2-D2 and C-3PO, an animated television series:
link

9. The Star Wars Holiday Special. The worst Star Wars piece ever made. There is an Urban Legend that at a sci-fi convention in Australia, George Lucas once said "If I had the time and a hammer, I would smash every copy of the Holiday Special."
But it does exist:
link

10. A huge mountain of Fan Fiction. some good, some bad:
link
I have done some myself using Hasbro's toy line, links to which are at:
link

11. The still in the works live action TV show set between Revenge of the Sith and A New Hope:
link

Did I miss anything?

I would read the Darth Bane books to learn more about the Sith.

Star Wars Cloak of Deception is a really good book that happens before Ep 1, in it Qui-Gon and Kenobi
stop a terrorist group that is going to attack the Trade Federation.

There are a ton of Star Wars books. Some take place before the movies, some in between, some during, and some after the movies. You can buy these at borders or Barnes and Noble. The last Star Wars book I read is 501st: Imperial Commando, which took place a month after Episode III.

There's that new animated TV show, Clone Wars, that takes place around Attack of the Clones and Renengve of the Sith.

Star Wars novels. They mostly go into the new Republic era. You know ( or may not) the times of where Luke Skywalker is now the Jedi Master of the New Republic. Han and Leia get Married and have three children, twins Jaina and Jacen, and little brother Anakin. Luke eventually marries too- Mara Jade-Skywalker former sith and hidden apprentice or follower of the Emperor, together Mara and Luke also have a son- Ben Skywalker. Most of them are trying to fend off lurking imperials of the Galatic Empire and enemies of far off star systems. Fun reads. You get to visit everyone again. And see what, you kind of knew would happen.

Have you ever wondered how the struggle for the galaxy began? How The Force was discovered? How the Jedi Knights and the Sith Lords were born?

A Much Longer Time Ago is a free (limited time only) online version of the first volume of The Origins Trilogy: Birth of the Jedi Knights and the Sith Lords. It follows the story of two twin brothers, Jedi and Sith, born to the queen and king of a world far, far away, 32 000 years before the events of Star Wars:The Phantom Menace. The struggle between the two brothers born with never-before encountered "powers," becomes the struggle for a world which then launches the process that gives birth to the Jedi Knights, the Sith Lords, and ultimately, millennia of struggle ending with the war for the fate of the Galactic Empire we all know so well.

link

There's a lot... Books comics, Clone Wars. Try going to amazon in books and see what pops up.

Star Wars is so dense that there are tons of books out there.Right now im reading like 4 star wars series.Jedi Quest which is about Anikan and Obi-wan.Jedi apprentice which is about Obi-wan and Gui-gon,The Last of the Jedi which takes place between ROTS and ANH. I'm also reading Rebel Force which comes after ANH but there are lots of books and comic books out there just do a search on google and you'll probably find alot! XD

i love the after episode 6 books their my fav and there are sooo many i have like 50 books to read and there coming out with more they will definitly keep you busy

there are so many places to find more things on starwars i mean i think it would be impossible or at least take years and years to read or find out everything. So i depends on what you want like do you wanna know more about what happens before episode one because like someone said there is the book called cloak of deception and i'm sure some others there is also the jedi apprentice series which focuses on when obiwan is younger (in the first book hes almost thirteen) and talks about how he and quigon became master and padawan and some of their journeys as master and padawan which i think is really cool some things really surprised me. If you like between episodes 1 and 3 there are several novels my favorite is the approaching storm which takes place right before episode 2 and is refrenced in the movie when Windu says "they just returned from a border dispute on anison" it talks about that mission there is also the jedi quest series which is focuses on when anakin and obiwan are master and apprentice its an easy series to read like jedi apprentice but a great series there are also several other novels. if you interet is between episode 2 and 3 the clone wars there is a series on cartoon network going to be in its third season called the clone wars and its absolutly fantstic i love it there is also the mini series the clone wars and several books. if you like the other eras there like i said before thousands of books on it.
you can also browse the internet and you will find loads of information like at wookipedia.com the information is out there you just have to seek it good luck and of course
May the force be with you

If you Like the COOL new Clone Wars TV show you might try the Star Wars The Clone Wars Republic Heroes game it has a good story with it if your interested.