I am having the same problem as "yoramsk" I can hear them perfectly fine, but they cannot hear me.
I tested it having both phones in hand and you can tell when im talking but its very chopped up and sounds like no one is there.
Same result on wifi and 3g, also tried both hacks.
Im using a rooted HTC Incredible with a custom rom running android 2.2. I might flash back to CM 126.96.36.199 and see if it works I'll let you know.
-Update- I tried it on CM7 (2.3.3) still no luck same result