My favorite: TextTwist

I don't often get the chance to pay games online, but when I do I like either this - or Texas HoldEm at PartyPoker.

With TextTwist, you form as many words as you can from the 6 letters they give you.

You must form a 6 letter word to move on to the next level.

Good luck!

I've played Text Twist, but not in a while. It's good.
My current fav is Crickler. It has daily news "fill in the blanks" plus vocabulary.