I love how simple yet effective this plugin is. I highly recommend it to anyone trying to aggregate links to their social media presences in one place.
In addition to Goodreads, I'd like to see support for About.me and Clippings.me (the latter also known as Cuttings.me, a fairly new portfolio service for writers and videographers).
I sometimes add services such as these manually by uploading icons to the default directories, but then they get wiped out the next time the plugin is updated. I really need to find a better place to put them!