USB mic doesn't work on MBP?

After reading a ton of threads here on the audio-in issue (the MacBook Pro doesn't accept a mic-level input, only a line-level input) I came to the conclusion I would need either a pre-amp or a USB mic. I chose the latter, thinking it's better to have just 2 pieces of equipment (the laptop and the mic) rather than 3 (laptop, mic, pre-amp). I bought a Nady USB 24M only to find out it's not recording audio either.
So I'm not sure if:
A) the mic doesn't work
B) the line-in input on the laptop doesn't work
C) I have a setting off somewhere
or
D) I misunderstood that a USB mic would work with a laptop
The mic's promotional materials say it "connects directly to any computer with a USB 2.0 input port for easy plug-and-play operation." That's really what I need "easy plug-and-play operation."
I'm trying to record audio in Quicktime using "New Audio Recording." In QT preferences, I've tried both "Built-In Input: Line In" and "C-Media USB Headphone Set." I've tried plugging a mic with phantom power into the line-in (to no avail) and I've tried the USB mic (again nothing). Am I doing something wrong?
Any thoughts or suggestions would be appreciated. Thanks.
- Mark

I have a 2.4 gHz MacBook Pro and use an Altec Lansing AHS302usb mic for external mic input during online gaming. It is actually a USB 2.0 mic and headphone combination that works in Windows XP via BootCamp and also in Mac OS X. I have successfully used this mic in BootCamp (Windows XP) for gaming in Battlefield 2142. Works fine - no problems at all. Windows and Mac OS both auto configure to use this external mic and headphones automatically when the USB connector is plugged in.

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