As others have previously mentioned, the best thing to do is get it right during filming:
-Set your white balance (then set it again, and again... in each room ... for each angle.)
-Use good lighting. And lots of it.
-For outdoor shots, remember "good" sun is too much sun. A bright sunny day will BLEACH the hell out of DV.
If we're talking post production, I find that upping the contrast nearly always helps. With color correction, you can get a "warmer feel" by upping the reds/yellows, but be subtle with it.
For DV/video that is converted to black and white, you nearly always need to drastically up the contrast to get a good noir look. For some reason, I prefer the look to the way Adobe After Effects does this to FCP, ... but it's a whole lot harder to do it through After Effects.