As I don't have an in-built bluetooth module (resp. Acer charges 300€ for it), I use the USB dongle to connect the laptop with my mobile (Sony Ericsson T 630). To get it working, you just need the bluetooth modules in the kernel.

I can use the mobile connection to make calls, read the SMS list and sync the addressbook with kabc using kmobiletools. A small app called "btcid" displays incoming calls on the notebook's LCD (with name and number).