Create Synchronicity is an opensource application developed in VB.NET to synchronize files and folders across different locations.
It is aimed at making the synchronization process as easy as possible, and yet remains fully customizable.
Create Synchronicity is especially light: zipped, it weights less than 80kB, which is less than a fifth of Yahoo! Home Page. Unzipped, the application itself is less than 170kB, still beating Yahoo home page.