Basecamp API: The Basecamp API has landed.
The API allows programmers to access/read/write Basecamp data from third-party systems like OS X dashboard widgets, Yahoo/Confabulator widgets, web sites, back-office systems, billing systems, and more. The API allows Basecamp to integrate with a variety of other products and systems.
Prepare for some gorgeous, gorgeous stuff to come out of this.
While not "gorgeous", but maybe "functional" and "practical", my company has released the first hosted service created exclusively to make use of the Basecamp API -- in this case a Support Ticket Add-on interface for Basecamp. You can check it out at www.BCTix.com
We have a few other things in the works, and one or two of them might be able to be described as "gorgeous" ...