New version of Nice Social Bookmark was released yesterday. It is basically the same extension but now it is compatible with latest version of Joomla! 1.6. You can download the new module in download section.
This new and updated version contains additional icons for these sites: Reddit, Newsvine, Technorati, LinkedIn, Mixx
I wanted to add a LastFM but it has no API for this sort of thing.
I want to have even number of icons so if you have any suggestions feel free to drop me a line.