just wanted to give my 2 cents:
i recently installed opera mini 5.1 via pspkvm
really awesome, do some micro browsing in the bed before i sleep or when i wake up
it can display full webpages really well
the GUI is somewhat laggy, testing with opera mini 4.2, the GUI/UI experience is much faster/snappier but 5.1 is just better (tabs, though it's not entirely useful on mobile device but still good)
must have if you carry your psp around with you with free wifi around unless you got wifi-enable phone
sadly, i cant use it down at my university, it just wouldnt connect but the original browser works, but it is heavy outdated and just shit after you use opera mini
i'm surprised how well it works, it's sad that the psp browser never got any update/love, sony needs to just have a native opera browser for a future update, the files to get 5.1 running are like 400kb total