HarryM - 2:23 pm on Dec 9, 2007 (gmt 0)

I think it would depend on whether your site name is also a brand name.

My guess is that users rarely look at the browser title bar, so they only see the page title when looking at search results. I always aim for a short meaningfull title, and would usually only put the site name in the meta description tag, and sometimes not even there.