Total_Noob found a kernel Exploit on 6.20 a very well known hacker/developer if you think he's fake so think twice before saying "its a fake" he used HBL with his method and said he's been having a kernel exploit in his hands for a while now but decided to start making a HEN
soon to be released before Christmas visit here:
http://www.psp-hacks.com/2010/10/08/wip-kernel-exploit-found-and-6-20-tn-hen-to-be-released/
or
http://wololo.net/wagic/2010/10/09/kernel-exploit-found-and-hen-announced-for-psp-up-to-6-20-by-total_noob/
Edit: 6.31 Users will have to wait a little longer but don't worry all you 6.20 Users will have the taste of Homebrew/Prx Module etc soon