After the painful upgrade to Ubuntu Hardy Heron, I now have full access to my Arduino from Linux. I just couldn't bring myself to enjoying programming it through Windows. So even though I couldn't make it work in Dapper, I just sat tight until Hardy.
I'm now up to lesson 3 in my lessons and I've got a little burnt spot in the middle of my field of vision from looking at my blinking LED for too long.
And the most helpful tips for 64-bit Arduino joy was from this fine Finnish chap.