E3 2010: 70 games coming to PSP before the end of the year
That's about two and a half a week

The Sony press conference is taking place at E3 as I write, and while most of the event has been devoted to showcasing PlayStation Move and 3D gaming, Sony did devote a little bit of time to PSP.
In short, there are 70 games due out on PSP before the end of the year - around two and a half a week. Here's a list of some of them.
Madden 11
Invizimals
God of War: Ghost of Sparta
EyePet
Piyotama
Patapon 3
Kingdom Hearts: Birth by Sleep
Fat Princess
The 3rd Birthday
Valkyria Chronicles II
MGS: Peace Walker
Ace Combat Join Assualt
Gravity Crash Portable
DragonBall Z Tenkatchi Tag Team
HotShots Tennis GetaGrip
P3P Persona 3 Portable
Ys: The Oath in Felgana