Rob Mensching blogs that the WiX version 2 is nearly done, just a few more bugs to slay. Two of the remaining bugs, about dropping/overwriting Sql databases, are important to me so when they are done I will be really happy!
I have been using it for some time now and it is really easy making installers for Windows and Microsoft.NET based applications.
I really look forward to the final release of version 2, and of course the upcoming version 3.