[tag:script] (featured in May)

https://stackapps.com/questions/9148/activity-indicator-see-if-you-participated-in-a-qa-at-a-glance

A beneficial script if you're active across multiple sites. 

And even if the script doesn't seem that useful to you, looking at the source, how it is organized and build for distribution is worth mentioning. I can learn a lot from that alone.