The obsessive compulsive side of me started maintaining a spreadsheet in 2005 of all my gaming purchases each year. In general, I managed to spend about $900 less than last year while picking up more games thanks primarily to increased use of Goozex (game trading site) and bargains I was alerted to at cheapassgamer.
Here's the breakdown:
360: 43 Retail games and 10 XLBA titles
xbox: 4 Retail games
DS: 9 Retail games
GBA: 1 Retail game
Wii: 6 Retail games and 1 VC title
PC: 18 Retail titles (2 purchased on Steam)
PS3: 14 Retail games and 3 PSN titles
PS2: 1 Retail game
PSP: 5 Retail games
Shalafein