I know this isn't exactly what you are looking for, but I thought I would at least point this out as a possibility...
I use a Belkin TuneTalk to record class lectures and it works like a charm! It's not exactly a microphone that you can clip onto someone's shirt or anything, but it records lectures with ease and the volume is more than satisfactory. Of course, my experience is recording a professor in a classroom when there is relatively little other noise. If you have any questions about my experience, feel free to post them or PM me.
http://catalog.belkin.com/IWCatProductPage.process?Product_Id=277661
I use a Belkin TuneTalk to record class lectures and it works like a charm! It's not exactly a microphone that you can clip onto someone's shirt or anything, but it records lectures with ease and the volume is more than satisfactory. Of course, my experience is recording a professor in a classroom when there is relatively little other noise. If you have any questions about my experience, feel free to post them or PM me.
http://catalog.belkin.com/IWCatProductPage.process?Product_Id=277661