Yeldarb has posted a great compilation on all the software released so far for versions 2.5/2.6 and 2.01 PSPs. heres what he posted:
Since releasing Snakman two days ago, I have been bombarded with tons of inquiries asking how you can run more than one program on 2.01+ firmware. Well, this is my little hack to get it working. It's nothing complicated. Basically, it's the source code of all three games that have been released as of now compiled into one game. It's a simple solution, but I suppose it works.
There's info in the file on how to add your own programs.