News via http://www.psp-hacks.com/2011/01/20/...6-37-released/

Sony makes a move… Available now via Network Update is a new official PSP firmware version — version 6.37. Whatever you do — do not update — not yet.
What’s new? This, apparently… “This is a minor update that improves system software stability during use of some features.” Yeah, eh.

We’ll keep you posted.

Update: Mathieulh shares some insight on 6.37…

To all the people that care about kernel mode on psp, the scepower exploit is fixed in the 6.37 firmware . Avoid the update.

“Signed” usermode apps just run fine mind you. (although they fixed a couple of (now useless) usermode exploits.)

This means signed [user-mode] homebrew still works on firmware 6.37; ISO loaders and other kernel mode dependent homebrew will not … for now.