I've been working on it for a few days now, but its finally released. Social Statistics is being used on this site and can be found on any page on an enabled site in a block. It provides pluggable statistics for (currently) 3 major Social Networking websites; Del.icio.us, Digg and Ma.gnolia. It currently boasts caching of statistics for a configurable amount of time, AHAH retrieval of statistics which are not cached (thus not slowing down page loads) and an API to make the project extendible to anybody who cares to add a Social Network to the mixture!
The core module consists, mostly, of a few menu callbacks and an API. This API allows the user to enable any number of enabled modules to add their contribution to the block. The 3 enabled sites all have an XML based API, but each does things slightly differently - hence my choice in using them as examples of the module as a whole.
You can find this module over in the Drupal Projects section.