In November, 6 games.

Own 43 games.
Bought my 360 in February 2006.
Switched to Elite in August 2007.
I think i've owned over 50 games, sold some, but still own 43 games.

I have 24 games for my 360.

Those are pretty low attach rates.

bought my system fall 2006 18 new games at the moment, no arcade, besideds what came with the system. one used.

@FaRmLaNd  Heh true but if i counted all the pc games i have, i might as well count the old xbox (36 titles all but 2 new, 1 is missing should be 37 have no idea where that went got the xbox in spring 02) too, since some of the pc games i still play need dos or an old version of windows.... that makes me feel old very old.  

I have 7 games right now.

Bought my 360 in October 2007 and I have 10 games for it right now. Its gonna get bigger as soon as the games I'm looking forward to are coming out, mainly GTA IV and Batllefield: Bad Company.

I've had my 360 since launch.

I have 23 games right now, but I have already fully paid for Ninja Gaiden II and GTA4! I only buy Special or Collector's Editions when available, with the exception being CoD4. I got that game a week before it was officially released so I wasn't able to get the Collector's Edition.

I only got rid of about 6 or 7 games which were mostly sports titles. I really regret the non sports titles.

I also own about 30 XBLA titles.

Edit: I have bought a few games from Gamefly which I guess would be considered used. So out of all my games I have 5 used. I also bought FNR3 again after making the mistake of giving it away. I've been contemplating re-buying Perfect Dark Zero but I probably wouldn't play it anyway. 

9 games, and preordered 2

I have 4 games, but it'll be 5 after GTA4, i already pre-ordered it.

got mine in Jan 08.