I just got the Macally Mic. I have tested it out with Fring and Sipphone apps. It does work, sort of. The problem with fring is you can't hear what the other person is saying because the speaker does not come on. In sipphone it kinda works. Sometimes you can get the speaker to work but sometimes it makes you sound like a serial killer.
I also have the sennheiser MM50's. They work pretty well. Not sure if anyone else has this problem but sometimes when I use it everything I hear gets distorted. Still trying to figure out what causes it.
You have a 1G on OS2.2?