Votive is a Visual Studio 2003 extension. It allows you to create "WiX projects" that act like any other project in a VS solution. The WiX toolset is integrated in this install, so all you should need is this MSI an no other downloads from Source Forge. Unless, of course, you want to integrate the toolset into a build lab. In that case, I recommend just downloading the binaries .zip file.
Votive is mostly stable (shouldn't crash VS2003) but still lacks many features. Feel free to play with it, but don't be surprised if it doesn't behave the way you like. File bugs or Feature Requests on votive, and we'll see where it leads.