i am looking for an application that is like dropbox. i simply would like to synchronize my music folder (which is 100 GB) via LAN between my desktop & laptop. (you can see why i cannot use dropbox for there is the size restriction and it will try to upload a bus load of files to its central server)
For bidirectional syncing, try unison (unison-gtk for GUI) from the repositories. Here is an old howto for setting it up.