In case you missed it on Slashdot, Microsoft has released an internal tool called WiX for generating MSI files from an XML description. Slashdot's going bonkers over the fact that this was released as an open source project on SourceForge, but the real gem here is the ability to easily (and cheaply!) generate production quality MSI files. There's even a decompiler that will reverse engineer existing MSI files. If the new house wasn't keeping me so busy, I'd have some fun with this tool..