When the omnibar extension first came out for Safari it wasn’t interesting for me since it supported only one search engine. BUT I’ve just discovered that since the Aug. 3 release (1.3) it has a search provider editor that allows keywords just like Chrome and Firefox. If I want to do a google scholar search, I type “gs<space><whatever I want>”. If I want an IMDB search, I type “imdb<space><whatever I want>”. It’s the only feature I sorely missed on Safari. And while I was using the half-useful KeySearch extension, it wasn’t very good since it can’t be key-activated from the url or search bar (or some other areas too).
Not only that, but omnibar comes as a serious blessing today since Firefox (both 5 and 6 beta) started causing tremendous disk activity on startup, idling! I have to purge the system of Firefox. I won’t go back now. The only thing I miss from Chrome and Firefox is native syncing. Xmarks for Safari is a drag. I only start it once a week or so to backup bookmarks.
If you miss omnibar on Safari, go grab it. I think Safari just became the best browser for Lion.