I'm not sure if this has been posted here on TL yet but anyway...
iloveoov = iloveoov
boxer = manofoneway
on the kr server of course
my source is one of the coaches of the NEX team and I was talking to him on msnger and wondered if he knew if those were just rumors and he laughed and said it's pretty much common knowledge (maybe only for the top players... I had no idea).
additional source: http://www.playxp.com/sc2/bbs/view.php?article_id=2110274&search=3&search_pos=&q=&page=2
this link lists all the confirmed pro BW players who are playing SC2 (the number of games vary but a good portion of them have an impressive number of games and rank). To name some famous ones that ppl might not know
Kingdom = KingdomW
Garimto = 가림토
Midas = Midas
bluek, that guy that played the epic PvT vs Boxer on Paradoxx = 바나나 (banana)
Daezang (also caster for GSL) = dzdzdz
Silver = Silver
Chrh = NEXKYumer
Additional pros I forgot about because I only checked for those confirmed with BNET id's attached:
Moon (from wc3)
Effort (it's on the list of 'confirmed' but even the replies on playxp are asking for confirmation)
lucifer (from wc3)
Oversky (caster for GSL also)
Lyn (from wc3)
sAviOr, ranked very high on the KR ladder is almost certainly an impostor.