From Canon website
PC Connection Kit (USB)
For enhanced PC connectivity, the MV630i includes a PC connection kit which provides a USB cable as well as a Digital Video Solution Disk. With this kit, users are able to connect the camcorder to a PC via the USB cable for high-speed transfer of still images from the memory card. Once imported, the images can then be edited and processed with the use of the Digital Video Solution Disk.
Also looking at the brouchure, it mentions firewire.
The SD card is intended for smaller size movies and still images. You will need to connect it to the pc otherwise you won't be able to download using tape (No big movies)
I'd assume you should be able to connect if you have a USB. I'm in the market for a camcorder myself so I'm going to have a play at the weekend. I'll be able to give you a better answer then.
Tried to have a look at the Dixon prices but their website seems to be down. Currys has the MV630i listed at £499.99, if Dixons is anything like it head online when you buy. You can get the MV650i for £390 click here