If you have a few idle moments… check out the free system profiler at Belarc. Tells you everything you want to know about your computer. (How do they do it? It looks as if it mines the Windows registry.) But there are all kinds of interesting things including the model and capacity of your hard drive, and memory.
The free download is for individual use only, nor for your organization. A corporate version is $19.95/year ($399 minimum) i.e. for 20 machines. This allows you to use a web-based application to create a profile for your machine.