I use MS Project Professional, Rational Tools (ClearQuest) and HP OpenView Service Center.
We use Ms Project too, and used Minuteman in the past, which worked well for us.
There is an open source option, among others, ]project-open[. 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).