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@Velocio
USB2 is fast enough to listen to music and to watch videos... but it's crap at transferring large amounts of music and videos.
USB3 on the other hand at 5gbps is fast enough for those jobs. With USB2 the bottleneck is USB, with USB3 the bottleneck (even with an array of SSD drives) is the speed of the drive.
Light Peak (a.k.a Thunderbolt) has good promise for the future (when it's actually optical rather than copper), but right now doesn't give you anything over USB3, and there is already tons of USB3 stuff on the market (looks at the 2 x 2TB Western Digital USB3 drives on my desk at the moment).
Thunderbolt isn't compelling enough a reason to do anything today, and if anyone thinks it is for the iPad then welcome to 1996 as the Palm also had to be tethered to be synchronised. Upgrades, iTunes sync... this shit should all be wireless.
No doubt about it, Thunderbolt will be awesome in 5 years time. Welcome to today though, it's not really anything at all.