What to Look for In a Fixer Upper I have decided to buy an older worn down bike and fix it up as my commuter.  What things should I look for?  I know I should check the frame for rust.  But, that's about it.  For example, is it easy to get a good condition cassette for an older bike?  Or, should I try to find a bike that already has one?  Advice like that.
Check for something that has easily available parts.  If you buy a bike that's too old, then new parts won't fit on it properly, and you'll have to either find old parts in good condition, or pay more for parts because they aren't made in high volume anymore.  I guess if you're talking about a commuter, then it's going to be a road bike. Make sure that it has 700c wheels, or can accomodate them.  Otherwise, finding 27 inch wheels and tires can be a bit of a pain.