Btsync 2.x tray icon and gtk+ gui using python and webkit for linux OSes.
First install the btsync python api from here.
Then execute the btsync binary:
chmod +x btsync
./btsync
Open your browser and go to localhost:8888/gui and setup your username and password. You only need to do this once.
To start the tray just run:
python main.py username password
Now everytime you want to start btsync with the tray run the command above.