In the latest release of DSL Tools we make use of the WiX toolset to create MSIs. Rob Mensching, the creator of this toolset, has blogged about what we have done. Without WiX, our job would have been much harder in implementing this feature... so thanks, Rob.
Rob also mentions Grayson Myers in his blog. Grayson is a dev on the DSL Tools team who implemented (and, to be frank, designed) this feature. Rob is right to compliment him on his efforts.