Enter Glims, a small app with allows you to add about 20 different search engines to safari and put them in order of your preference.
Other long-awaited features include:
- Full screen browsing
- Undo close tab using Cmd-Z
- Favicons show at the top of tabs
- Thumbnails in Google and Yahoo searches.
- Session saving
If safari supported all the features that Glims provided, a lot fewer mac users would be switching to firefox.