On March 11th (iPad2 Release Day) At&t has enabled the HotSpot Feature on their iPhone. This feature is a step up from their basic tethering which has a 2gb data and 1 connection mac. To clarify At&t still calls the HotSpot "tethering" but it is their next teir which is a 4gb tethering plan, unlike other carriers At&t caps there max connected devices to 3. I currently have been grandfathered in to their unlimited plan thus far but decided to add the HotSpot feature to take advantage of my iPad2 on the go however by doing this it changes my plan there by losing my unlimited plan. Seeing that I have never reached the 2gb over the years I belive/hope 4gb's will be fine. Setting up The HotSpot feature is pretty straight forward you access this feature within the Settings-General-Network section of your phone. There will be an option called "Personal Hotspot" with an on-off option. Clicking on this will bring you to a new page with another on-off option as well as the ability to set your Wi-Fi Password. This page also included information on how to connect using Wi-Fi, Bluetooth and USB. Once your password is set (make it a secure one) turn on the Hotspot.

After setting this up for the first time you will no longer have to drill into that many menus to turn on an doff the Hotspot. The iPhone creates a new option right inside the settings menu(4th one down)

To connect to your iPhone from any device look for the name of your phone in your devices wi-fi section and use the password you set in the HotSpot options

When a device is connected the iPhone will show on the top of the screen how many devices are connected

Be aware when you have the Hotspot turned on your iPhone will no longer connect to local Wi-Fi networks you will have to turn it off in order to use it again. (watch this you don't want to run up your data unnecessarily)

I have the Hotspot with my iPad2 and works flawlessly doesn't take long to find the wi-fi at all and am pleasantly surprised with the speeds I was getting. As for my MBP v6.2I  have not used it a whole lot but so far so good (will post more after more use)