I'm sure that at least a few people on this NG own/use a chainsaw from
time to time, so...

I've been wanting to get a chain saw sharpening tool, but wasn't sure
what type to get - dremel attachment/clamp on angle guide/freehand
file/etc... I ended up getting an angle guide/file kit made by
Husquavarna from Lowes ($14). The kit comes with two round files and a
flat file, a handle, and a small angle guide. The little guide is about
an inch square and just sits on top of the chain, straddling a cutter.
The guide aligns itself with the chain so that the correct angle is
easy to obtain.

After just a few minutes spent figuring out how to use it, I was able
to sharpen the chain in less than 10 minutes. I went outside to make a
test cut on some recently cut logs - wow, this chain is scary sharp!
Very impressive results with almost no learning curve and little time
invested.

Anyway, for what it's worth, I'd highly recommend Husky's file kit.

Mike