I'm a big fan of the Vibrant Ink theme for Textmate. I spent some time last year porting the color scheme to both vim and Visual Studio - that's what you can see in the screenshot. I'm releasing my _vimrc and vssettings files if you want to experiment with this stuff in your local configuration.
I also use ViEmu in Visual Studio so that I can use the same keybindings everywhere. This is especially important if you're doing Windows development on a Macbook Pro since there are missing keys - and the key chords that you have to use daily on a MBP to achieve equivalent functionality to a standard PC keyboard are annoying at best, or will lead to RSI at worst.
You may notice an inconsistency between my vim and VS settings. I was a two-space indent guy before coming to the company, but everyone else around here has a thing for four-space (not tab- yay!) ident, so I caved.
Update: I'm an even bigger fan of Fusion now, since the crazy race condition problem for grabbing a wireless network connection here on corpnet seems to be gone. This problem manifests itself when I suspend my MBP by closing its lid. When I open the lid, both the Mac OS and Windows machines try to grab their own wireless connection on corpnet (I cannot use NAT). Under Parallels, this would result in my laptop getting booted off corpnet (maybe 50% of the time) until I shut down Parallels, waited until my host OS got a connection to corpnet, and then restarted Parallels. This wasted a ton of time, and resulted in me walking around a lot with the lid open ...
