I got a Pandora Battery + a "Magic Memory Card" for $19.00 USD at www.bargainpile.net. It even had a step-by-step instruction manual. Took me about 15 minutes after charging the Pandora Battery. That's what I'd do. The only things it doesn't work with are PSP GOs, certain PSP-3000's, and PSP-2000's that start with AB02 on the barcode (on the bottom of the PSP). I'd recommend using a PSP-2000 that doesn't have the AB02 on the barcode.
I have a PSP1000 currently...so that'll be what I mod for now. I WANT to get a PSP 2000 so I can hook it up to a TV, but that is in the future a little bit. That is a heck of a good price though, so I have that book marked.
Turned out a friend of mine actually had XML2 sitting in his garage, so he dug it out and gave it to me. YAY!
SO I'll probably order the Pandora on Tuesday.
I have SO much to occupy my time right now learning all of this stuff and playing around. 8)