So, yesterday I thought I would start experimenting with this video stuff. I set up my macbook on a stack of piano books on the corner of my piano, recorded the video (and room sound) through my iSight, recorded the audio through my mixer to my M-Audio microtrack, then used iMovie and Garageband to replace the sound with the mic'd version. Didn't pay much attention to dressing up my set or anything (which I might regret), just pressed record and sang into the mic like normal.
This is me singing I've Got You Under My Skin in my living room. Youtube downsampled the audio so it's in mono (and you can't hear the reverb either), but you can get the full-quality source audio if you're subscribed to my standards podcast.