PSP network update

I just checked the PSP for updates, and it looks like a (slightly) newer version is now available! I successfully downloaded the update, which required 14 megs free on the memory stick, only to find out that I need to have the AC adapter connected during the reboot process for the thing to install... and now I have to download again.

Oh well, looks like it just finished. So now PSP System Software Version 1.51 should be installed. I wonder if they added anything new, or if it's just a bug fix. It says it's a revision to strengthen the security, so I guess they're not done with the browser and other stuff that supposedly leaked onto a Japanese web page a while ago.