I'm personally a certain user of Firefox, but I still use Firefox 2 with the last update of 2.0.014. I'm very surprised to get started with Fire 3(but not in Beta), so I prefer to wait till it comes out. Today I found a interesting post about the abilities of Firefox 3 SearchBar. As with this snapshot below, there are another snapshots added in this post. So if you're still not a user of Firefox 3 beta 5 like me, this article gives a good imagination of awesomeness and functionality of Firefox 3 SearchBar.
Deb Richardson is the author author the about:mozilla newsletter, who wrote this explanation.