I saw a side-by-side comparison of the PS3/Wii browsers a while back - and I believe the Wii browser won in every area. That said, there is plenty of scope for the PS3 browser to be upgraded - so Im sure you'll get Java support... eventually (within 2 years...). Otherwise, just install Linux and go for it!
Gesta Non Verba
Nocturnal is helping companies get cheaper game ratings in Australia:
Wii code: 2263 4706 2910 1099