These are some of the games I've found that can be played by webtv users. Enjoy!
CHECKERS
GAMESVILLE
YAHTZEE
SCV GAMES
GAMES GALORE
ALL MIXED UP
FUN BRAIN
TRIVIAL PURSUIT
80'S GAMES AND TRIVIA
BATTLESHIP
ACE GAMES
CARD GAMES
SCROLLING MYSTERY THEATER
MYSTERYNET
VIRTUAL BUBBLEWRAP
DEEPSPACE9'S GAME COLLECTION
WEBTV GAMES