Blue Microphones has released Nessie, its long-awaited USB microphone for use with either a Mac or PC. It's a simple mic that allows you to record straight to your computer without any setup. Its three settings—one for raw recordings, one for richer vocals, and one for optimized instrumentation sound—give you the choice to record how you want (to an extent) without any post-recording production (unless you opt for raw audio). With the right adapter, Nessie can also plug into an iPad.
Check it out on the Blue Microphones site.