Well I did enjoy WarioWare Touched, SM64 DS kept me busy for quite awhile, Pac Attack (or whatever it was where you drew the pac man was lots of fun), Advance Wars DS, Nintendogs, Kirby Canvas curse (I think that was out during that period), Trace Memory and I know I'm forgetting a couple.
To put it into perspective, when I got a PSP at launch I played Twisted Metal (wasn't interested in a card game version of MGS) and when I was dcne with the game I sold it on ebay. The PSP had such a blah lineup of ports that there wasn't much else out there for it.