Can anyone tell me if there is some lightweight software for Blackberry to send SMS from PC and/or Mac. I own both and would ideally want to send from both via a bluetooth connection. Ideally this software would be free or reasonably priced and most importantly lightweight, not built into some massive goliath of software. If there is one for PC and one for Mac that would be even better.

Ideally, this is what I'd do:

1. Open software
2. Ensure Bluetooth is on on handset
3. Type message to PC or Mac
4. Hit send
5. *SMS SENDS*

Well, I know AIM has the function to send SMS texts to phones, if that's what you meant.
You can also download JiveTalk which has AIM on it too and can send SMS.

Let me clarify: I don't want a dodgy "free SMS" service or send from my PC to the phone. I want to compose messages on my PC or Mac and have it send via the phone on Bluetooth.