Well as long as FF: Crisis Core & God of War: Chains of Olympus are coming to the US on the PSP in 2008...it's already a huge success to me. Possibility of FF: Dissidia & Kingdom Hearts: Birth by Sleep in Japan too....Those 4 games will be huge--bigger than anything that was released in the US in 07', meaning, I don't think the PSP can do much worse this year.
Anyhow, those are 4 games that I'm looking forward to about as much as anything I want for the Wii, 360, or ps3..(don't own a DS, so don't know).
And Jeanne d'Arc is probably a top 5 game of the year for me --- all consoles included...still play that game in 8 hour sessions at a time! That single game is reason enough for me to have bought a psp.
PSN ID: Sorrow880
Gamertag: Sorrow80
Wii #: 8132 1076 3416 7450