The 7d seems to have the edge in terms of overall rating (89% vs 87%) and the general text of the review definately favours the 7D.

Personally I dont see any point in having video in a DSLR, I had the D300 before and loved it, I gave it away to a friend because i wanted to go full frame but now I cannt justify the extra money as i dont make any money out of my photography. If I could find a D300 for a resonable price, new not 2nd hand, then I would go for it but since every one seems to have the D300s in stock I thought i get some opinions about the 7D before making the purchase. but to be honest I've always been a Nikon man and Love their lenses and the way they handle.
Currys had stock of the D300 a few weeks ago when most other shops had stopped selling - not sure how much they overstocked, but might be worth asking in store and getting them to do a search on other stores as well. They were selling it for £899.
I agree with ^^^
Getting a feel for the things and the way they handle/menus etc would be a great idea. Why not take a CF card and try both cameras out with your own CF card and then review the images on the PC later?
As I said though - the camera is only part of the equation and after a couple of years you'll probably upgrade it. But the lenses etc will last longer (generally), so it might be worth considering each brand as an entire system rather than just a camera body. Nikon don't have quite as many options in terms of lenses but the ones they do have are better than the Canon equivalents imvho.