Whos.Amung.us is a neat widget we came across tonight that some websites will want to add. It shows the number of concurrent users on a site at any given time.

Clicking on the widget also gives good stats on the recent URLs people visited as well as popular pages. Like Sitemeter (which we also have in the bottom right of the sidebar), it doesn’t do anything Google Analytics or other stats services don’t do – but it is an easy way to share more data about your site with your readers.

There is also a firefox extension that shows the total number of readers on your site at the bottom of the browser at all times.

We’ll keep it on TechCrunch until it manages to take the site down for the first time (every widget we add seems to do this eventually).