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BluePhoneElite allows you to use your Mac's speakers and microphones as a "wireless headset" for your cell phone.
I just got mine set up, and it's pretty cool. I can open a panel and send a txt message without having to use AIM or any other tomfoolery like the keypad on my phone. That means I can copy and paste something from my mac, straight to a txt message. Pretty cool.
My roommate was annoyed as I was testing the voice capabilities. It's basically a speakerphone setup. You can initiate and end calls from the program, so you never really have to pick up your phone at all.
I like, I like.