I've created a new Greasemonkey user script awkwardly named "Metafilter mark contact contributions". I mark people that I've met at meetups as contacts on MetaFilter, and I like to be able to have a reminder when I see something from that user. Slashdot has a feature like this built in (it uses small green and red globes), and I figured that with some of GreaseMonkey's cross-site XMLHTTP functions, this would be pretty easy. It was.

Install Firefox and Greasemonkey and right click here to install the user script. Here is a sample screenshot.