I use MS Project Professional, Rational Tools (ClearQuest) and HP OpenView Service Center.
We use Ms Project too, and used <a href=”http://www.minuteman-systems.com/”>Minuteman</a> in the past, which worked well for us.
There are some open source options, among others, <a href=”http://www.dotproject.net/”>dotProject</a> and <a href=”http://www.project-open.com/”>]project-open[</a>. I have used the former for a couple of personal projects, and I liked it.
If it is really small project and the company has MS Server 2003 I use SharePoint to manage my projects as well, there is a good book SharePoint for project management by O’Reilly, this has lead me to set up my own sharepoint site and i use this on my freelance projects (1and1.co.uk does a cheap SharepOint site you can rent for a month at a time).