I just added some javascript plus little extra code to what is known as the "postbit" template - it's the one you're looking at now.
The output is a neat little "fly out" box at the bottom of the column where your avatar is displayed and it provides your Media Center specs without putting them in your signature, or asking someone to visit your profile page to see them.
Of course, given that the the code is wrapped in some <if> <else> tags, unless you've added your system details
to your profile - (look for "My Media Center" in the left column of your CP) - nothing will show for you.
So now's the time to fill in those little boxes guys.
