By my count:
-D/ND*
-1 vs. 100*
-Identity
-Rich List
-Show Me the Money
-National Bingo Night*
-Smarter Than a 5th Grader*
SUMMER:
-Set for Life
-Singing Bee*
-Don't Forget the Lyrics*
-Power of 10
*returning for 2007-08 season
Well, if you include the summer shows, that makes 11. Otherwise, I counted seven traditional game shows, not reality shows like American Idol or America's Got Talent. And despite what NBC says, D/ND is a game show, not "reality" like they want people to believe.
From what I remember, there were four in 1999-2000 (Millionaire, Greed, Winning Lines, and 21).