Nanoformats :
extend twitter capabilities to give more utility to the tool.
give more semantic information to the twitter post for better filtering.
use commonly used (or semi-standard) parameters like microformats
are extensible, customizable, mashable

Instantbird is a multi-protocol Instant Messaging client. Using it, you can connect to all your different IM accounts. It uses the Mozilla rendering engine to display IMs, and the Pidgin libpurple to connect to the different networks.

Pidgin 2.0 is a highly extensible and cohesive platform for multiprotocol Internet communication that includes broad support for essential instant messaging features and common protocols.

In a nutshell, it's an open source, cross-platform messaging platform competitive with commercial products like Exchange and open source projects like Hula.