SynchroMike
Successor: <a href="http://syncarus.net">syncarus.net</a>
SynchroMike is a two-way synchronisation program which allows the user to synchronize two directories. It comes with a handy user interface which displays differences between both storage locations as a tree.
Update: This page is deprecated, find the new program at <a href="http://syncarus.net">syncarus.net</a>