Where can I find cumulative software sales?

[Viper1]

http://vgchartz.com/ayearly.php - North America

PS3 - 24,943,627
X360 - 93,049,670
Wii - 59,687,765

http://vgchartz.com/japyearly.php - Japan

PS3 - 4,846,715
X360 - 2,628,351
Wii - 18,608,391


There isn't one for Europe, sorry. But you can get the software to hardware ratio from NA and apply it to the hardware total for Europe.

NA:
PS3 - 5.5
X360 - 8.1
Wii - 5.8

Extrapolated European software totals:
PS3 - 27,610,957
X360 - 49,345,127
Wii - 44,055,454


NA + Japan totals:
PS3 - 29,790,342
X360 - 95,678,021
Wii - 78,296,156


Total including extrapolated Euro sales:
PS3 - 57,401,299
X360 - 145,023,148
Wii - 122,351,610