Let me say smth. ;)

What you'd do if you need a solution installer for both 2007 and 2010 Sharepoint? Well, I've found an interesting solution by Vojtech Nadvornik. In general, he modified code of well known codeplex solution . Actually, it has few minor imperfections, so I decided to make some refactoring. I changed Welcome page title and fixed Administration Service check (it didn't work on 2010). Binaries can be downloaded here and sources here . If you have any questions fill free to ask me here in comments - I'll try to answer ASAP.

Obviously old solution installer for 2007 MOSS ( cool project on Codeplex ) doesn't work for 2010 Sharepoint. Luckily I found people who had worked on the same problem and found a solution . Andri proposes rebuilding solutions in .Net 4.0, but his solution also works with old wsp files. So just replace old Codeplex setup.exe with Andris one and that's it! Thanks to Andri for his solution. Btw seems this project will be popped up soon officially SharePoint 2010 solution installer Some update on this topic may be found here