i traded all my games in apart from all the ps2 gta's and max payne so im not as bothered about this as is used to be, plus i have a ps2, id just rather play my ps2 games on my ps3 but, for the wireless controller, the slighty improved graphics smoothing.
i only have a big bulky madcatz or some other brand controller for my ps2 and i cant stand using it lol.
but according to sonys blog: http://share.blog.us.playstation.com/
which is for ps3 users to voice their opinions on how to improve the system, BC, is the second most popular demand
sonys answer is always, "we're looking into this"
hopefully sometime soon we will have a firmware update that enables BC, or hopefully rockstar release a GTA ps2 HD collection for ps3 lol.
also when reading on sonys website about BC, it said that ps1 games are supported for BC, i wasnt aware of this apart from the ps1 classics on the store, but their site suggested you could play hard copies.