Socialoomph. com Probably being the best and I believe the free membership allow the auto follow back, and you can also add a Direct message back to the follower thanking them.
Other sites,
tweepme. com
ifollowback. com
100freetrial. com
bestfollowers. info
twitterator. org
refollow. com
You asked the question and got the answer m8 I dont own these sites so I cant vouch for their webd. Socialoopmh Is a fairly popular and well known service so I would go with them for sure. The others are optional.
I did a search on Google for the keywords "twitter auto follow back" and found AutoFollowBackTool.com as the first result.
I've never tried it, so use at your own risk,
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