Here are the plugins installed in my psp. My psp's CFW(Custom Firmware) is 6.20 TN-E.
Cxmb - Custom Themes
Aloader - Load ISO gmaes directly form your xmb. Including NP9660 and M33
Audio Boost - Increases your PSP speaker volume by 30%!
Prx Shot - Take a screenshot at game or at xmb by pressing the NOTE button
My Installed Custom Themes
New Playstation Experience
Well I only have 2 Themes Istalled.
Hope this post helps.