the free online repository site I'm using has a built-in issue tracker
Which free online repository site are you using?
Didn't want to sound like I was advertising, nor stir up a Git vs. Hg firestorm, so I didn't name names, but I suppose there's no harm in saying Bitbucket. Github probably has similar features, but the deciding factor for me was Bitbucket's unlimited free account for those with a .edu email address. As a broke grad student, I couldn't turn that down.
Just to add to this for the benefit of other people reading this thread, I use unfuddle,com for source control on my personal projects. It allows totally free svn repositories to anyone but with the free account you can't have multiple users on projects. I don't know if they provide source control using software besides subversion.