Which was your first and how many have you purchased since that first one?

My first PSN game was PixelJunk Monsters. Currently have 24 PSN games.

My first was WipEout HD, and I currently have four. Order of purchase:

1) WipEout HD
2) Flower
3) Rag Doll Kung Fu (free)
4) Fat Princess

I also have Linger in Shadows, which I got before WipEout.

EDIT: I have two PS1 classics as well: Crash Bandicoot (which is pretty good) and Syphon Filter (which is god awful).

just 2 so far, my first was Crystal defenders, the second (just bought a couple of days ago) Worms.

First was Linger in Shadows, though that's not "really" a game.

Then flower, Savage Moon, and probably soon to be ratchet and clank

First: Blast Factor

The rest (in no particular order)
Flow
Mortal Kombat 2
Calling All Cars
Everyday Shooter
Super Stardust HD
Fat Princess
PixelJunk Monsters
PixelJunk Eden
Ratchet and Clank: Quest for Booty
WipEout HD
Linger In Shadows
Echochrome
Flower
Pain
Worms

First one I bought was Soldner-X. I also have High Velocity Bowling, Shatter, Linger in Shadows, PAIN (free with the MGS4 bundle), and Rag Doll Kung Fu. I also got the PSN version of Gunstar Heroes.

Rag Doll Kung Fu (cos it was free on PSN US)
Flower
Elefunk
Trine
Cuboid
Savage Moon + Waldgeist addon
Shatter

first one was Savage Moon

If the special offer for Ratchet and Clank: Quest for Booty comes to Europe it will be my next purchase

My first one is Flower and it currently is the only one. I'm interested in Elefunk, but it costs 8 euros and I think it deserves 5; in Fat Princess, but EU got ripped off on the price which led me to pass on it and they have removed it from the store a few weeks ago for whatever reason; in Ratchet & Clank: Quest for Booty, but I'm waiting for a PSN store discount since the EU store has those weekly now.
I was curious about the Penny Arcade RPG's, but they're too expensive for what they are, so I passed on that as well.

My first was Super Stardust HD. Currently have 22.

Dont know the order but
Linger in Shadows
Flower
Burnout paradise (yes i did)
wipeout HD
Flow
Worms
Zen Pinball
Superstardust HD
FF vii
magic carpet
Wolfenstein (?)
street fighter 2
echochrome
Tekken 5