Windows only: Up-and-coming instant messaging application Digsby has released a new update with significant performance improvements and added support for business-oriented social networking site LinkedIn. Performance improvements include optimised RAM usage (the fruits of the last test release), a snappier interface, better connectivity with IM networks, and bug fixes galore. Beyond that, the IM application that made its name by integrating with social networking sites like Facebook and Twitter continues to improve by adding social network LinkedIn to the fold. Digsby has quickly established itself as a killer tool for managing and staying up to date with IM, email, and social networking, and right now the biggest question is: When will we see the promised Mac and Linux flavours? Digsby is a free download, Windows only.