This just may be the catalyst I needed to get around to installing Visual Studio 2008: the availability of the F# September 2008 Community Technology Preview. This takes F# an important step closer to being a full .NET citizen, with the first release delivered by Microsoft's Developer Division (the previous releases having been delivered by Microsoft Research).
It's not required to use VS 2008 with this release of F#, but that's the version that's been targeted for the IDE integration, naturally enough. I've been holding off from installing VS 2008 for some time - mainly as ObjectARX applications still require VS 2005 - but if I had a crystal ball I'm sure it would show VS 2008 somewhere in my near future... :-)
It is, of course, possible to install VS 2008 side-by-side with VS 2005, but also to use it to develop applications based on the .NET API exposed by the various shipping (& supported) versions of AutoCAD.
Now I just have to make some space on my hard-drive... <sigh>