I’ve also ordered the following accessories to get my BeagleBoard up and running (all ordered at Mükra Elektronik):

USB-Serial Adapter (you can get the drivers for MAC OS X and Windows here)

Serial Null-Modem Cable (9-pin d-sub to 9-pin d-sub)

USB 2.0 Mini-A Cable (for connecting the BeagleBoard USB OTG port to my MacBook as the power source)