like i said, there don't exist 100% java counterparts. i've given the most common ones. btw, many SE phones haf the netfront browser!!!
and about the formats, would u really copy a 5min divx video of 45mb in ur cellphone? at least i wudn't. i wud convert it to mp4 cutting down the size to about 6-7mb to view it on my cellphone. my SE phone supports mp3/mp3pro/aac/mp4/3gp. agreed it doesn't support real media files. but then if i encode the realmedia files at low bit rates in mp3, i get better quality than real media files at the same size! and i can do it at the click of a button!!!
like i said, u'll get java apps which are practically useful!
also, about the threat regarding java apps. i am yet to see a symbian based phone which doesn't run J2ME apps! so if there's a threat regarding java apps, symbian based phones are equally affected as non-symbian phones! but the vice-versa is not true!
i'm not crtitising symbian, just giving my experiences and views!
cheers!