Dark Alex Firmwares

What exactly are the features in the Dark Alex firmwares. I have been away from the PSP scene when I heard he left but now that I see the new 4.01 firmware I found a PSP charger and will be using my PSP as long as he is around. What are the current features though associated with this new firmware that came out?

All features of the official firmware it is based on (there are many versions of Dark Alex's [M33] custom firmware), plus homebrew support and the official PS1 emulator is unlocked to allow you to play your own PS1 games.