Quote Originally Posted by gaystoryman
Given how easy it is for people to customize their blog templates, there really isn't a safe standard. However like I said, 160 is pretty well safe, 120 might be too narrow.. 140 would be maybe your safest... but my opinion only.
I agree on the 140 width - it seems to work really well in sidebars on various templates. Not too small and borders out nicely if the sidebar is 150 or 160 overall. Various heights is good - I seem to be leaning towards those that are in the 300 range or making my own that fit 140x300 presentation.