The three main announcements that have changed my mind are - Adobe have a 64bit version of the flash player available , and both Firefox and Chromium/Chrome are available in 64bit versions. I know there are some applications like Adobe Air that are stubbornly remaining 32bit for now, but you can work around this with 32bit libraries. This is not ideal, but I can live with it for now.
I have this morning burnt the beta to a USB pen drive to test the Dell XPS 1330, and all went well, with the wireless connecting instantly and I was browsing the web within seconds of the OS booting. I downloaded the 64bit version of the flash player and it worked with both Chromium and Firefox. The one thing I noticed was how rapid the system worked, considering it was working in Live mode from a USB pen drive. This could be a combination of the new version of Ubuntu and the native 64bit applications, but time will tell on that one.
I now have to back up all the "stuff" I have managed to collect in /home over the last couple of years , and then I will blow away the currently install OS and give Ubuntu 64bit the harddisk, and unless I hit any really major problems, I 'm going to stick with this as it really does seem silly to be running a 32bit OS on the latest 64bit hardware.
I will post again shortly after the upgrade and on any issues I hit on the road.

