Just curious to know how many games do you own for your Xbox 360.  I had mine for about 13 months and have 7 games in Saints Row, Marvel Alliance, Gears of War, Crackdown, Guitar Hero 2, Dance Dance Revolution and Halo 3.  So I am basically a little over the 6 games attach rate that MS keeps touting when the monthly NPD numbers come out.  Is the attach rate for the life of the console or only base don how many you buy the instant you get an Xbox 360?  All the games I bought besides Marvel Alliance I got during the launch day of that game. 

Looking at the latest weekly charts provided by ioi it shows many 360 games in the top 20 though in general the charts has tons of 360 games all over the place.  It just seems software wise the 360 is doing quite well though there are just so many games to choose from.

Back to my question how many Xbox 360 games do you have if any and is the attach rate calculated when you buy the system or through the time you own it?

I have a 360 since it's launch I only have a 360 so no handhelds / pcgames / ... + I'm buying them together with my brother.
I have 19 games.

Fahrenheit
Halo 1,2,3
Blue Dragon
Oblivion
Enchanted Arms
Forza 2
Fifa '07 / '08
Condemned
Saint's Row
Viva Pinata
Gears of War
Bioshock
Battle for middle earth 2
The godfather
Virtua Tennis 3
Kameo

Interested in Dead rising , Overlord , Orange Box , PGR 4 , Mass Effect , Guitar hero 3 , Scene it , VP party animals

I've sold some but here are the ones I have bought (not including the stuff I have Gameflyed):

Gears of War
Dead Rising
GRAW
Halo 3
Blue Dragon
Viva Pinata
Forza 2
Bioshock
Kameo
Condemned
Guitar Hero III

... I might be forgetting something but that's all I can think of for now. My friends and I swap a lot of games between each other, too.

Gears, GRAW 1 & 2, R6V, Viva Pinata, Crackdown, Rock Star TT, Saints Row, Kameo, COD 2, Oblivion, Forza 2, The Darkness, Bioshock, Halo 3, Orange Box, and Guitar Hero II. 17 games

i have my 360 since feb 06 with 5 game, GRAW, Moto GP 06, GoW, Bioshock, Halo 3.

I've had my 360 since Feb. 07.

Blue Dragon (Bundled w/the system :) )
Trusty Bell (aka Eternal Sonata)
Burnout: Revenge
NFS:Most Wanted
Madden 08
Bioshock
Gears of War
Halo 1,2,3 (yes 1/2 are xbox games, but I never had an xbox)
Saints Row
CoD 3

So 10 total not counting Halo 1/2

Also have Beautiful Katamari coming next week, and NBA Live 08 soon after that.
Planning to pick up Lost Oddysey in Dec., too.
Possibly some older games too when I get the chance, i.e. Forza 2, Viva Pinata...

15 games, soon to be 16. Had it for just over a year.

I've had mine since March 06.

Games:

Bioshock
Halo 3
Gears of War
Oblivion
The Outfit
Call of Duty 2

So 6 total and apparently I like shooters.

Arcade:
Super Street Fighter 2
Carcassonne
Geometry Wars
Bomberman Live
Worms

Rented:
A couple of movies

Imo ms is making a good profit in the next couple years.

Also, since no one else seemed to answer, attach rate is total games owned per console, not games at time of system purchase.

Well based on the responses here that attach rate will just continue to grow for MS so they can keep on flaunting it.