An oppertunity to use MSN with iChat has been long wanted by people and now there is a solution to it.

Cocoon is an MSN-lugin for iChat that recently been released in a beta version for OS X Lion.

It is a beta version and according to Joshua på Macgasm it is not completly stable yet. All the functions are not yet in place,  the option of sending files, avatars and handling groups are missing.