Some weeks ago we improved and unified the settings for the tag cloud. If you have JavaScript enabled you see now above your tag cloud the options for sorting (Which could be either by frequency (i.e., how often you used a tag) or alphabetically.), layout (You can choose between a cloud or a list.), and minimal frequency (Allows you to show only tags which you used at least that often.).
Output of BibTeX now includes tags in a field called "keywords", which is more common than "tags". When importing BibTeX, both fields are merged.
If you post a single BibTeX snippet, which you already have, you can see the duplicate on the edit bibtex page. Furthermore the postBookmark button has been updated: selected text from the page is now automatically included in the description/comment field. On the settings page you can now update your email address, as well as your homepage and real name.