I have a Samson Go USB microphone that I really like. Like a proper audio interface it even has a headphone jack so you can listen to your Band-in-a-Box backing tracks while recording a great sounding vocal. I find I don't have to equalize what gets recorded on the Go microphone like I do with some of the other microphones I have. The microphone just sounds good.
Samson has a complete line of USB microphones including USB versions of their top of the line multi pattern condenser microphones.
+++ THIS +++ webpage describes all their USB microphones.
Most microphone companies seem to have USB microphones. Many take the approach of replacing the XLR connection with a USB connection that is Windows compliant so equipment specific drivers are not needed. It is getting easier and easier to find a USB version of whatever microphone is a favorite.
My complaint is every USB microphone I've looked at uses 16 bit depth analog to digital conversion. While that matches the CD audio quality of RealTracks and RealDrums the extra headroom provided by 24 bit depth when mixing makes me wish more 24 bit USB microphones were available.