Consolas Font Pack
The Microsoft Consolas Font Family is a set of highly legible fonts designed for ClearType.
I've blogged previously about how I enabled ClearType because it should improve productivity. I've left it on at home with the LCD monitors, but I reverted back to the standard fonts on the CRT monitors at work as it was just too fuzzy to work with.
Unless you're using ClearType on a suitable monitor, I wouldn't bother with these fonts. They don't look that great on my CRTs. I'll give them a try at home though.