A little more info on the diy kit:

In theory you can use it to port anything. For big stuff, you probably want to wait for the eboot loader, because it will still be fairly hard work.

It's very much for experienced coders - you've gotta get your hands dirty in a way that EBOOT-coding shelters you from. Having said that, there's some auto-magic in there that makes life a little bit easier.

If you want to make v2.6-compatible stuff, you'll be limited in what you can do. There's only a small part of the whole PSP API that's available, so far, on 2.6. Filling in the blanks is possible but hard, and tedious.

But for v2.0-v2.5 stuff, you could pretty much port anything if you know what you're doing. Still, you'd have to do a few small tricks to port large stuff.