^ Its called a sidebar, but a two-sidebar.
90% of the sides I visit use a single navigation sidebar.
Examples:
TMK NES World Metroid Database World of Warcraft official website (threw that in as a joke)
Now, most of those sides DO have a second sidebar for news and stuff. However, I don't want SMBHQ to become too cramped. It had the two-sidebar format before and I grew not to like it (that's why I changed it last year)