Shelf is an app for Mac OS X that looks at the current foreground application, and tries to figure out if what you're looking at corresponds to a person in your Address Book. Then it'll tell you things about them.
What's new in Shelf
Made work under Snow Leopard, Python 2.6, etc (Anil Madhavapeddy)
Crazy experimental Google Reader support (Safari only)
Support more versions of Chrome, hopefully. They keep changing the AS support.
Added a Spotlight provider that attempts to grab e-mail messages and attachments exchanged with a particular contact (Rui Carmo)
Tightened up indents and removed blank lines in some files to make it easier to work on a somewhat cramped screen.