Aha! Finally a moment for me to Shine, here is alot of Deviant Sites I have gathered, both BE and busty chicks.
http://cattyn.deviantart.com/ - Used to be a main face in the expansion world, but alas stupid, greedy people almost drove him insane and he has sworn off drawing expansion (more or less). He is still drawing some wonderful art (personally I like his Goth Girl) so go check him out.
http://t03nemesis.deviantart.com/ - Apparnently also known as Dagrimmace, though alot of his work isnt there, and seems to be scattered over various sites, still there are some nice peices around.
http://drewgardner.deviantart.com/ - Master of both BE and various busty girls! Personally I like his recent Vicky drawing. One of my Fave Deviants!
http://thunderfoxjt.deviantart.com/ - Mainly Anthro drawings, still there are some nice BE in there from the Rouge the bat (From the Sonic games).
http://beac.deviantart.com/ - The Breast Expansion Artists Club, pretty much speaks for itself, alot of the stuff is decent, though, try its favourites list for the best stuff!
http://sirkowski.deviantart.com/ - Home of the Comic strip "Miss Dynamite", some very good art, and a nice flash animation of a girl who is a bit too big for her bra :P.
http://be-mix.deviantart.com/ - Some nice BE art here, though not much.
http://boobtastic.deviantart.com/ - A Brilliant Artist, not much BE that I can find, but alot of hot chicks with large boobs!
http://inflate123.deviantart.com/ - A classic BE writer, hasnt been updated in a while though...still some good stories there.
http://lostprophetseishin.deviantart.com/ - this is a new artist for me, havnt really scoped out thier work, though...I did like part one of the Naruto story, check it out to see what i mean.
http://pulsetastic.deviantart.com/ - Lightfoot's Deviantart page, Home too Eve, Pulse and the ever so bouncy Tifa. Top grade art and BE found here. (I dont think I did Lightfoot enough justice, its just hard to express in words at how good this stuff is
)
http://in-sane-o.deviantart.com/ - Some good drawings here, though in-sane-o seems to have stopped updating recently. (PS Check out the incedibles pic...it wont disappoint!)
http://artmasterj.deviantart.com/gallery/ - Once again some great BE stuff check out "Jenna's Story, Breaking Point", which isnt technically BE (its her at different stages in life) its still damn good stuff.
http://spathicblond.deviantart.com/ - Another Writer, some interesting stories can be found here, though Blond updates infrequently, some of it is some high class stuff!
http://kevin-generic.deviantart.com/ - Dont know much about this artist, though there is some good BE finds in there (not to meantion a heap of busty chicks) a good find!
http://blooberboy.deviantart.com/ - Again, a new artist to me, not much work there but it seems to be updated often. The art is a mix of BE and other expansion stuff.
http://neoslashott.deviantart.com/ - A brillaint artist, I like alot of his stuff, some AP in there, though the odd BE gem shines through: check out "The Super Maria Sisters" for example.
And well that it from me for now... Don't forget to check these guys favourites too, often you can find some great stuff in there.
Until next time.
Edit!: I have a great respect for all of these artists, and I expect everyone to do the same, no begging for art, no bad mouthing them etc. I've seen several artists just give up dealing with people who treated them like art vending machines, only there for the viewers pleasure. Well they aren't so if your going to talk or post on the artists work, show some damn respect.
Oh and to any of you artists that I linked, if you want me to take down the like to your page, give me the word its done.