After running Ubuntu Karmic Koala for about a month on the my Dell D420, I have decided to give OS X a try.
I started here.
Ended up here.
10.5 was a bust.
10.6 works great!
The process I used was:
1. Get 10.6 disc or disc image.
2. Make an external hard drive version of it.
3. Boot from the D620SLV1 [...]