Are there any conflicts with having any combination of Visual Studio 2003, 2005 and/or 2008 installed? I noticed a related question here but wanted a more general answer.
I have all 3 installed and have had no adverse problems...knocking on wood
6, 2000/2001 (I can't remember which is .net 1.0), 2003, 2005, 2008... of course within .NET you may have issues with getting the right solution with the right version. I haven't really seen any conflicts in particular.
6/2002/2003/2005/2008, I believe, can all coexist.
Though just this weekend I purged 'em all except 2008 as it went totally mad and stopped showing the build output. Plus my splash screen wasn't right. Now it is.
Just make sure you only have RTM versions and not Beta or RC versions installed. You'll have no end of pain if you don't cleanly remove the beta or RC versions before installing the RTM versions.
I've got 2005 and 2008 installed concurrently.
2008 is a superset of 2005, so I have no reason whatsoever to have them both, I just haven't gotten around to un-installing it yet
I have them all installed concurrently. no issues.
Now if you can tell me how to install SQL Server 2000 and 2005 concurrently without issues you win a prize.
The only minor problem I had was that I installed 03 after 08, and all my solutions then became assigned to 03. Assigning them to the version selector instead was all I needed to do.