I just installed #develop 2.1 Beta 1 to take a look at it. I don't planned to replace my VS2005 with it, especially since I'm programming in C++ a lot and #develop isn't a C++ IDE.;)
Unfortunately #develop changed the filetype association of sln files, so now my C++ projects are opened with #develop. To make things even worse, I opened up the options and told #develop to not associate with sln files and now those files are associated neither with Visual Studio nor with #develop. Restoring the association to Visual Studio isn't that simple, because VS uses a shell extension to display different sln file icons for different project format versions (VS05 projects have a small "8.0", VS03 projects a small "7.1" and so on).
Since Visual Studio doesn't seem to provide a way to reassociate file types, I'll have to reinstall Visual Studio. :(
It would be great if you'd stop #develop automatically associating with sln files. Instead you should extend the installer to ask the user which filetypes it should associate with and which not.
TiKu