I was able to successfully tether my BlackBerry Bold via bluetooth to my Windows 7 RC laptop.  The best part is I dont have to pay for a tethering plan through AT&T and there is no software other then the bluetooth software needed!

Basically all you do is make sure your BlackBerry and Laptop are paired together via the Bluetooth software you have on your pc.   When you create a dial up connection use the following initialization code for AT&T:

+cgdcont=1,”IP”,”wap.cingular”

Setup new dial up connection using a standard modem, and have both the username and password blank, and use the phone number of *99#

 I actually am getting pretty impressive speed for a cell phone connection:

These three links helped me find the correct settings to set this up:

http://Blackberryfaq.com/index.php/Using_BlackBerry_As_Modem

http://Blackberrycool.com/2009/03/how-to-tether-your-blackberry-for-free-via-bluetooth-mac-and-pc

http://Forums.pinstack.com/showthread.php?t=92043

Had to dig around for this.   In your Outlook contacts, if you open the contact and then go to the all fields tab, select miscellaneous fields in the pulldown and look for the field named "User Field 1" towards the bottom, that is the PIN field.

Once in a blue moon this question is relevant.   From my experiences it's pretty hit and miss on clients that actually take advantage of the PIN field and BlackBerry Messenger.   It's either they use it heavily, or they dont use it at all.