My laptop is Dell D630, came with USB 2.0, and the speed of the USB 2.0 almost drive me crazy especially copying some HD movies. I think most of us who use the old USB 2.0 will have the same feeling.
So now USB 3.0 is coming! I would like to know what will you do to add USB 3.0 ports to your old laptops(don't tell me to buy a new laptop with the USB 3.0 ports, I will use it for another one or two years).
Well, you can wait or try now, I won't advise you further. Don't have time to look at those links either, going on Vacay.
I use both PCMCIA and Xpresscard (Bytecc RAID and Vantec) and get full speed, much faster than Firewire800 and especially USB.
BTW, you know most HDDs are limited to 60MB/s, look at the interface speeds to see max, but magnetic disks usually top out @ 60-80MB/s you need an SSD (and a GOOD one) for max speeds. Those links are likely drive limited.
BTW 50+MB/s is higher than USB already (which is theoretical 480Mb/s but practical 400 and less).