This answer is to add weight to the YES side of the argument.

I am mostly a team of one. I extensively use issue tracking (redmine) together with SVN integration.

It is truly superb and I would go crazy without it; my quality would drop because I'd forget about things, and I'd loose track of what I've got to work on.

Productivity tools:

• Decent IDE
• Issue tracking
• Source Control

Issue tracking; don't leave home without it