If you are in the same situation as me where you have to develop web applications on Windows XP and have many projects on the go and for what ever reason cannot just stick each into its own virtual directory then XP Pro IIS Admin is the tool that you need.
What it does is allow you to create multiple web sites in Windows XP (as it only permits one web site) and gives you a little interface for easily switching between them. This makes it much easier to work on multiple projects, especially when the projects expect to be sitting at the top of a website, rather than stuck away in some virtual directory somewhere.
The Blog of Colin Mackay 