I think one of the most attractive features of Facebook is its chat feature. It lets users instantly start conversations with their Facebook friends without installing any IM software. However, a problem here is, users need to be on the Facebook.com website in order to use Facebook chat. If you are looking for a simple IM desktop client for Facebook chat, you can try fTalk.
fTalk is a free messenger application (IM client) that enable you to chat with your Facebook friends from the comfort of a desktop IM client, you don’t need to login to Facebook.com. It provides a more pleasant environment than the built-in Facebook chat.
Currently fTalk offers following features:
fTalk is rather a new application, so it is limited with features and may contain bugs. However, the developer claims that they will add more features in future.