I came across a couple of great articles on upgrading Ubuntu to the latest build.  Given that version 7.10 "Gutsy Gibbon" is being released out of beta tomorrow, it seemed to be a very timely find.  Kevin van Zonneveld shows two ways to upgrade:

• 1-step upgrade if you're like me and have Feisty Fawn or some other version running with few to zero tweaks
• 3-step upgrade if you've really muddled with the Ubuntu system.