Is there any good iPhone stand with high-quality microphone for my desk? I use my iPhone 4 to go jogging and at some point the built-in mic has gotten damaged and the only way to talk to people is via an earbud with mic.

I am looking for a desk charger which also has a high-quality mic so that I can take calls from my desk, hands-free. Does anyone know of a suitable product?
There is no product that provides a stand and charger with a mic, but there are several external mics you can clip onto the iPhone. Some (lower quality) use the headphone jack, and some (higher quality) use the 30-pin docking port.

Here are two examples:

IK Multimedia iRig Mic Cast

This mic uses the headphone jack.



Tascam iM2W stereo mic

This mic uses the docking port, but has a pass-through USB connection that permits charging while the mic is in use.