Ok, I must still be heavily under the influence of my pre-OSX days, but the following just amazed me: Today I was synchronizing my G5 to my Powerbook, and realized that Sync Pro X was reporting 3.00 GB of data needing to be transferred. I looked at the throughput meter in the Powerbook’s menu bar and saw 1.3 MB/s. Ugh—I forgot I was unplugged and the Powerbook was connected via WiFi. I wondered if I could just simply plug in the Ethernet cable during the middle of the data transfer operation, and just gave it a try. The throughput jumped immediately to 8.7MB/s. That’s amazing—the system just transparently switched from one network interface to another (the faster one), right in the middle of a transfer.