Right, I've taken delivery of the laptop and am now updating Ubuntu on it!
The laptop looks very smart, runs fast and quiet and is very easy to type on (full size keyboard).
Installing Ubuntu was a bit of a pain due to the pre-installed partitions Dell give you. As they don't provide a Windows 7 disk, it comes with a recovery partition and some other partition (not sure what this is for yet!). They then give you a 60gb OS partition and the rest is for your docs. However, as Linux needs it's own partition and the maximum number of partitions is only 4, I had to merge the O/S and docs partition (and of course shrink the docs partition).
So that was Ubuntu installed, and then it was getting the wireless working as Ubuntu doesn't come with the Broadcom wireless drivers. This was fairly simple though, just a case of connecting it up via cable and getting the proprietary drivers.
Overall, I'm very satisfied so far, got everything running as I want on Windows and am just sorting out linux!