I was so excited to get a Go, but after a lot of thought and with a lot of my favorite sites starting to give it rather poor reviews, I decided to cancel my preorder. I DID get a shiny new system and a few new games with that money, though.
GameStop-exclusive bundle for $200 (nearly all my PSP Go money):

it comes with 1.)a special-edition silver psp 3000 with these lovely bluish buttons (see the picture)
2.)Dissidia: Final Fantasy 3.)a 2 gig memory stick 4.)Final Fantasy VII: Advent Children UMD movie

*I also found a copy of Rock Band Unplugged used- price? One of my birthday gift cards!
*Today I found a new copy of the new Persona with the 2-disk soundtrack (I'm renting it from Gamefly right now..not getting very far due to just sitting and listening to the soundtrack!)- price? another of my birthday gift cards!

*Bought $20 playstation network card because NIS is having a fantastic sale Oct 1-7th: all their games get slashed 50% (I know, a PSN sale?! Gasp!).
My copy of Disgaea is falling apart from use, I want Disgaea 2 and Prinny: Can I Really Be The Hero? and I'm planning to see what else pops up on that list. Tomorrow, the PSP Go comes out but more important, we see what new/old games get released or re-released on the Playstation Network. It's like waiting for my Birthday..or Christmas!

For those wondering what's wrong with the PSP Go, I'll give you my main concerns
1.) Uses a completely new memory stick format the M2..get ready to toss your sandisk pro duos!
2.) it's flimsy..not much metal and the thin plastic encasing it probably won't last very long with heavy use
3.) Battery life is about 3-5 hours! watch a movie, charge it. Play a few hours of a UMD game with intense graphics?(cough*dissidia*cough) charge it again. No thanks
4.) It's top-heavy when open.
5.) It's quite cramped when playing, even for someone like me who has small hands.
6.) Bad glare even on its brightest setting and completely unplayable outside even on an overcast day!
7.) Digital Distribution..ONLY..make of that what you will
8.) Price. 'Nuff said

UPDATE: IGN's editors all weigh in on the PSP Go. They also have a review up, but this article is an interesting read along with their review. Their video review I have posted here, but as usual, if you want something more in-depth, read their 3-page review on it. Good points.