How to keep track of bug progress and feature request in web development projects?

I am trying to find the best way to maintain a bug tracker and feature/upgrade requests for clients on web development projects. Ideally it would be an open source system we can have installed on a sub domain of our site.

This will then allow each client to login and add bugs/features/upgrade which we can hopefully keep track of.

I have been trying to use and implement trac but it just feels too "techy" and a little too complex for setup.

Any ideas?

Thanks in advance,

Shadi

UPDATE

Just to clarify, we do want a system to install on our servers, the trouble with trac is the install process in relation to what you get and how clients feel about it is a little poor开发者_JAVA技巧. But if something is awesome but has a complex setup, that isn't a problem...

Mantis is another. Simple UI.

http://www.mantisbt.org/

If you have Linux boxes, trac is much easier to install. Config takes a bit, but wasn't a problem in my experience.

I've heard good things about FogBugz. :) If you don't want to install it yourself they have a hosted solution also.

Have you taken a look a Bugzilla? Not sure if it meets all your needs but it is free but you can get paid support. It's an open source project AFAIK.