re: Ted's "mismatched socks"--I replicated the problem with the tag reverting to all caps, and he's right. Can't change it even if I copy the record to my library and rename the tag.

Yes, it's annoying, but at least the tag still serves the function of locating materials that it describes.

I'd love to hear more about your experiments with connotea and BibSonomy, and zotero.