I'm actually looking forward to Phantasy Star Online, Hammerin' Hero, and the Final Fantasy fighting game. Little Big Planet might be fun, but the rest of the games aren't to exciting to me. With the exception of the Monster Hunter games, I haven't been interested in really anything on the PSP in quite some time. I use the damn thing to play games fro my PS1 library on the go predominately.
On the other hand, theres a crapload of stuff coming out soon for the DS that I'm super excited about, namely The Dark Spire and Tokyo Beatdown both from Atlus. (I know you guys have probably never heard of either)
I liked Assassin's Creed, but the DS game SUCKED. I hope it's not some kind of revamp of that garbage.