The best part about Vim is that I can take Vim with me when I use both Eclipse and Visual Studio; there are great projects available for implementing the true,

The best part about Vim is that I can take Vim with me when I use both Eclipse and Visual Studio; there are great projects available for implementing the true, modal Vi editing model for both IDEs. ViEmu, although not free, is a first class Vi mode for Visual Studio, so good that there's barely anything I use in Vim that isn't available in ViEmu. For Eclipse, Vrapper is an excellent newcomer that implements a pretty large portion of the Vi command set. It's not as complete as some of the other Vi modes for Eclipse, but it's definitely the best integration I've found, and hasn't fallen done in edge cases like the others have.