I'm with ya, Windbane. There are some really fun games for the PSP. I'll add to your list: Killzone (far better than the trash on PS2), Daxter, and the amazing Syphon Filter. I also just got a brand new copy World Tour Soccer from Gamestop for $8. On it's own, a lot of fun. For just $8, a steal. The Sega and Capcom retro collections are wonderful as well for the old school fan. You nailed one major problem with the PSP, which is the perception that it's all bad PS2 ports. I think even bigger than that, though, is simply price. For $200 for the system + $40 for most new releases, it's a pricey handheld, especially for people trying to save up for a next-gen system. The PSP's one price drop away from huge success, and with a great lineup of games, now's the time for a $150 PSP
My Top 5:
Shadow of the Colossus, Metal Gear Solid 3, Shenmue, Skies of Arcadia, Chrono Trigger
My 2 nex-gen systems: PS3 
and Wii 
Prediction Aug '08: We see the PSP2 released fall '09. Graphically, it's basically the same as the current system. UMD drive ditched and replaced by 4-8gb on board flash memory. Other upgrades: 2nd analog nub, touchscreen, blutooth, motion sensor. Design: Flip-style or slider. Size: Think Iphone. Cost: $199. Will be profitable on day 1.
Essay Pro