Here we go some new (some old) links.
First we have an absolutely great japanese inflation artist featuring the old fashioned air pumps and helium tanks. There is also forcefeeding and WG.
http://haruka.saiin.net/~lapiness/flame.htm
http://haruka.saiin.net/~lapiness/dangergallery.htm
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Here we go with one artist who features some BE. The art features some BE, but also some bondage themes. Not the nicest, but worth mentioning.
http://beeigee.h.fc2.com/top.html
http://beeigee.h.fc2.com/ehtml/debuka.html
Of course it looks like she gets a bit of a WG too.
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Another belly inflation site. No process or anything. The webcomic section has one with a girl getting raped with her belly inflating and what-not. I don't really recoment this site that very much.
http://002399.919homepage.com/user/
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Here is a fantasy themed site featuring just one girl going through a dungeon or something. Various BE and Belly infolving tenticals and bugs.
http://rie.dojin.com/hp/index2.shtml
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I might as well throw in meatball in for good measure. The art can be disturbing. Be careful! Lots of inflation and a lot of gore!
http://chicken.h.fc2.com/top.html
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Another WG site. Some blue haired chick seems to gain weight and lose it a lot in his drawings. I can't open them though.
http://www4.inforyoma.or.jp/~fukusima/