Now isn't this the cutest little mic you have ever seen? It's the Blue Snowflake. Portable, USB plug-and-play, so they say, for Macs and PCs.
Hopefully it will sound as nice as it looks. Available for less than $100 in a month or so. Blue's Snowball also looked nice, but it took a while to work out the bugs. Hopefully by now they have the digital experience needed to get it right the first time. This is just in time for a high-tech stocking stuffer!
Electronic Musician had a pretty thorough review of six USB mics last April. All the mics rated well, they "characterized the Blue Snowball as having the brightest reproduction of the bunch. It has excellent clarity, and its dual capsules, two polar patterns, and pad setting are a plus. The rear coloration in omni mode was a minor annoyance." This indicates how there is no perfect mic, you really need a "kit", depending on what you are recording. Or determine your recording setup before you buy your mic.
If you have any mics you don't need any more, I can provide them with a good home.