The 2010 release is a bloggers dream or curse. There are so many things that one can write about. In previous releases there was a Render tab on design bar. with Revit 2009 this design bar got really simple, just one button (it is also a Teapot on the View Control Shortcut bar as mentioned in a comment, forgot to say that here before).
With 2010 there is no Design Bar and Render does not appear on any Ribbon tab or panel. If you want to render you can only render in 3D views so the single button that appeared on the Design Bar tab that is no longer...it still appears on the View Control Bar instead, just in a revised icon in the form of a little Teapot. Max users might find this one quicker than others since their icon for Render has been a Teapot for a number of years.
Here's where you'll find it now!