I have successfully had side by side widgets in my sidebar with no trouble. As you can see here:

theadventurebite.com/food

but when I add the javascript for the BlogHer ads to the top of both widget areas instead of displaying it at the top of the second column it drops the second ad all the way down below the first column.

I have to have them side by side in order to display both of them as they require above the fold placement.....but I can double my ad revenue if I can show both of them this way so I'm pretty motivated to figure it out

Thanks for any help!

Dani

Maybe fiddle with sidebar widths or the code for the ad. Hard to tell as this would require playing with the various possibilities.