On a personal productivity note, having installed a decent pop-up YubNub client, I’m finally finding that social command-line tool useful. Most-used commands? quote, gim, w, sendsms, gbg, and gnews, among others.
[Update] Nivi has an entertaining YubNub command, pi-search, that lets you search for any string of digits deep within pi. Just YubNub pi-search followed by the digits. For example, I can find the last seven digits of my parents’ phone number at position 16,620,197 in pi. Good to know in case I ever forget.