Dreamwidth style system discussion

Nah, sidebar's the default for Practicality - but it does have header as an option! OP, if you go to the Modules section of /customize, look for the Navigation module (for me it's the second one down, but if you've moved modules around it might not be), and in the drop-down, select 'Header' instead of 'Main Module Section' and save :)

(my arm for drag and drop module configuration - I should put that on my styles skyscraper list...)