So I just bought a Macbook Air 11". It's a fantastic machine, I would recommend it to anyone with a budget for one. I got the base version, which only has a 64GB SSD. I find myself transferring files to and from the device and my old laptop quite frequently. Transferring a whole season of Dr. Who, for example, is ~10GB, and takes a while over the 802.11g network we have set up. Theoretically I could use a crossover cable and transfer at gigabit speeds, but the Macbook Air doesn't have a LAN port. Both machines have 802.11n built in, but I don't feel a need to buy an N router. So I put both machines in ad-hoc mode, and transferred the files with around 10x speedup. I found it to be extremely useful.
Here's a tutorial explaining how to create an ad-hoc network.
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