I recently came across a tutorial on apexdevnet which shows you you can create a tabbed account page using Visualforce. The tutorial has been around for a while but its the first time I've seen tabbed browsing like this in salesforce - take a look!
http://wiki.apexdevnet.com/index.php/Tabbed_Accounts_in_30_seconds
For those of you out there with the really long page layouts this could help tidy them up.
