Pocketgamer have put up a list of why the PSP will rock in 2007, heres the summarised top 10:
1) New PSP
2) New Peripherals
3) EU PS3 Release
4) Price Drop
5) Downloadable video content
6) Gran Turismo Mobile
7) Technical Improvements
8) MGS Portable Ops
9) Nintendogs and co
10) Sony refocus