I don't know about that. I would love to have an extension that made the omnibar a lot more like firefox's awesomebar (good indexing, can search for key phrases for title of article and the such) but to my knowledge that's pretty much impossible because of the javascript limitation (I hope I'm wrong here, not really sure).

I just wish google was a bit more subtle about wishing people search on google again when looking for previously viewed sites.