I've spent a long, long time trying to sort this out but have failed miserably. Reading the 60D and 430EXII manuals, they seem to be saying that you can only use a flash off-camera if it's acting as a slave to one on-camera.
Digital
Make sure your 430ex is in slave mode and on channel 1
On the 60d go to 1. Flash control, 2. Built in flash function setting, 3. Wireless function, 4. Select the middle icon, it looks like a speedlite. Then you should be ready to go....
Hope this helps
Jason