I’ve just been looking through a selection of 100 free Wordpress themes and it would appear that for the most part navigation is now placed on the right – at least when running a site with Wordpress.
I found myself running through the list and discounting anything with this right-hand side navigation. This is probably conditioned into me from the years of website building before blogs became popular. It could be that I’m banner-blind to anything on the right of the page because that’s where the ads usually are.
It certainly doesn’t matter from an SEO point of view – the nav can be floated left or right with the stylesheet anyway so spiders can be made to read your text first whichever side you run the navigation on.
Maybe I’ll change my thinking one day but for now I still prefer my navigation on the left.