- Something installed Visual Studio 2010 SP1 on a coworkers machine (after VS2012) had already been installed. It screwed up his ability to install extensions. His Visual Studio Version Selector got replaced. http://stackoverflow.com/questions/3304425/visual-studio-version-selector-doesnt-open
- When you have a dynamic site and set everything to no-cache then file downloads will break in older versions of IE http://support.microsoft.com/kb/323308
- A great example of how things /should/ work, I found myself returning to this old post talking about Ward Cunningham's work on the Eclipse MyFoundation portal.