Since Visual Studio 2008 shipped last November, I have been asked a few times via my blog about if/when the Votive Visual Studio add-in that is a part of the WiX toolset will support integrating into VS 2008. It was not very well publicized initially, but the version of Votive included with WiX v3.0 has supported integrating into VS 2008 since the VS 2008 beta 2 timeframe. Specifically, this has been available since the 3.0.3328.0 build of WiX v3.0 on SourceForge. The version of Votive in builds between 3.0.3328.0 and 3.0.3621.0 were built using the beta 2 version of VS 2008 and the August 2007 CTP of the VS 2008 SDK. However, those builds of Votive will work correctly when installed on a system that has the final release of VS 2008 installed as well as systems that have VS 2008 beta 2 installed.
Votive in WiX v3.0 has also recently been updated to build with the final release of VS 2008 and the VS 2008 SDK. Builds starting with the 3.0.3621.0 build on the WiX releases page contain these changes. An announcement was also added to the front page of the WiX SourceForge site about Votive support for VS 2008. That announcement states that builds starting with 3.0.3607.0 contain these Votive build changes, but that build number is slightly incorrect because of some issues related to porting the changes into the source tree available on SourceForge.
One of the nice things about Votive in Visual Studio 2008 is that you no longer have to install ProjectAggregator2.msi prior to installing wix3.msi in order to be able to install and use Votive in the Visual Studio 2008 IDE. You can simply install VS 2008 standard edition or higher, then install wix3.msi and you're ready to launch the VS IDE and create WiX projects using the Votive add-in.