A bit off topic, and I know I'm sounding like a condescending jerk here but I mean it: but why do people love bugs so much that they want to purchase an entire database program to track them? I mean, if you have more than 10 bugs that are highly important to keep track of, it seems to me that you have much larger problem than whether to purchase JIRA or FogBugz.
I mean, either a bug is important to you so prioritize fixing it, or it isn't important to you so you can just ignore it and see if it surfaces again.
Every single team I've seen that used a bug tracker ended up with hundreds of issues, status of 90% of which was unknown, maybe already fixed, maybe not relevant anymore because the entire component got overhauled the other day by Joe. What's the use of this stuff?
I got this from a blog post (by Ron Jeffries I believe, but I forgot), but basically his idea was that the moment you turn something that you don't want to have into a formalized process, people tend to bias towards getting more of it. If you are forced to choose between fixing a bug or forgetting about it, you're urged to fix it fast. If you can just "file the bug and go on with your work", the bug stays.