This was submitted by Andy Adams of The Theme Foundry, so publishing my thoughts here. The interface is close to what one would expect from a Theme Options panel which is good, though the usage of the metaboxes UI for sectioning might not be the best approach. Meta boxes are for different purposes.
One might also argue that the social profiles have nothing to do with Appearance and should be in Settings or Users, though I understand that it’s not always possible to take them with you to a different theme. However, a widget might, if it was in a plugin. I don’t have a strong opinion on any of the different ways here.
Post your thoughts and suggestions in the comments section, and don’t forget to rate this entry! Thanks :)