I just got the Catlike Whisper helmet on sale at Competitive Cyclist and had it on today for a really windy ride (first 25 miles steady into a 15-18 mph headwind) and while I could hear the wind and feel it, obviously, it wasn't as loud as I expected. I could hear ambient sounds, including cars. I'm very impressed with the helmet. It's comfortable, light and while I initially regretted buying the bright, alien blob green, it's saved me twice in town when people saw me coming (or at least saw my bright green head) in areas where their view was blocked by parked cars. YMMV

I second the glove mirror. Very clever. :-)