Word-Gamer has a recent blog post on 10 tips to win at Scrabble. These are tips that every Scrabble player should know.
http://word-gamers.blogspot.com/
#1 Look to play Bingos
Playing a seven-letter word will give you a quick 50 point bonus. Champion Scrabble players would rather exchange a bad draw of lettes than play a 5 or 6 point word. DON'T be afraid to exchange letters...especially at the beginning of the game when there are lots of open places to play a bingo.
#2 Play two directions with a hook
Add one letter to a word then go a different direction. This can quicly gain you additional points for an normaly run-of-the-mill word. Use the s, r, and d letters to your advantage here. Find a word that ends in e and many times you can add any of these letters and then play your own word in a different direction. Look especialy for higher point words that you can add onto.
I ALWAYS forget the oh-so-important two-letter words when I play but whenever I look online for a decent list, there are dozens of conflicting reports on what is appropriate. So this is my complied list of acceptable words for American tournament play approved by the National Scrabble Association. The words in bold are words also acceptable in the United Kingdom and in most Commonwealth countries.
AA AB AD AE AG AH AI AL AM AN AR AS AT AW AX AY
BA BE BI BO BY
CH
DA DE DO
EA ED EE EF EH EL EM EN ER ES ET EX
FA FY
GI GO GU
HA HE HI HM HO
ID IF IN IO IS IT
JO
KA KO KY
LA LI LO
MA ME MI MM MO MU MY
NA NE NO NU NY
OB OD OE OF OH OI OM ON OO OP OR OS OU OW OX OY
PA PE PH PI PO
QI