From: Craig on
F/OSS, cross-browser & platform-independent. Tried it for a while but
can't warm up to it. It works very well. Worth a spin, at least, to
see an original take on an old problem.

> adx is a minimalistic but massively Web-enabled address book that
> runs completely in your Web browser. It supports comprehensive
> details for each contact entry, including user identifiers and
> profiles for Skype, Twitter, Flickr, Delicious, Facebook, LinkedIn,
> studiVZ, instant messengers, etc. It supports the hCard and XFN
> microformats.

http://adx.elektronengehirn.net/
--
-Craig