Thinkpad official downloads RSS feed - Thinkpad2RSS

Very cool website here.

Enter in your 7 character product number (for instance, 2623D3U) and the website will give you a RSS feed of firmware and driver updates available for your Thinkpad.

As an example, going to http://tools.4dots.com/thinkpad/2623D3U will return all the updates for model 2623D3U.

The easiest way of finding your product number, besides looking on the bottom of the laptop, is to run msinfo32 and make a note of the System Model.