oh yes there are. Most are stubs, not longer than one or two chapters, though.
Here are a few links:
Estella Warren devolves:
http://www.bearchive.com/~addventure...52/252939.html
Jessica Simpson's devolution
http://www.bearchive.com/~addventure...54/654002.html
Magic Wand: Jennifer Ape-iston
http://www.bearchive.com/~addventure...71/571455.html
Another Magic Wand chapter
http://www.bearchive.com/~addventure...17/617001.html
Loser Heroes: Wonder Beast (liked that one
)
http://www.bearchive.com/~addventure...39/539813.html
Beth devolves. ( Basically the start of the WWE Raw devolution branches - with a lot of celebrity neanderthals)
http://www.bearchive.com/~addventure...23/723957.html
Primitive aerobics
http://www.bearchive.com/~addventure...41/741262.html
Bleach: A Pill to Alter and Transform ( This one has a very long storyline with a lot of TF for the bleach characters.)
http://www.bearchive.com/~addventure...53/753222.html
Loser Heroes: Wonder Woman: Grodd's sidekick
http://www.bearchive.com/~addventure...81/781316.html
Teen muscle (just a slight devolution, but it had prospect for more)
http://www.bearchive.com/~addventure...33/733988.html
MW Ballet Studio: Things get hairy for Carrie
http://www.bearchive.com/~addventure...75/775495.html
Celebrity Changer: Lacey's devolution. (This one is really not bad, the TFs are among the better written ones, i think)
http://www.bearchive.com/~addventure...14/914126.html
Jim MW: Devolving Corine (a were-cavewoman... Why not?)
http://www.bearchive.com/~addventure...97/997739.html
Aaand, last but not least the amazing ...Marvel Cavemen!
http://www.bearchive.com/~addventure...29/729950.html
there are probably more of course...