The PSP is getting another firmware update today, so if you've turned yours on and noticed it prompting you to download your update and wondering what it does, here are your answers. For starters, FW 5.50 allows unregistered PSP owners to window shop at the PlayStation Store, and by that we mean you'll be able to enter the PS Store without an account and view what's available.
Clearly, you won't be able to buy or download anything without creating an account first, but letting you see what you're missing out on is a pretty good little move on Sony's part, one I'm surprised they didn't think of earlier. Furthermore, the other little update made to this firmware will allow PSP owners to access the PlayStation Network's Information Board from the PSP's XMB (Cross Media Bar), just like PlayStation 3 owners can, bringing the experience between both consoles that much closer.
Additionally, you can now browse your memory stick's subfolders, in addition to being able to filter the content that comes through your PSP's browser, courtesy of Trend Micro Security and Safety designed for the PSP. It's not a giant firmware update, but new features are always fun.