I have just splashed out on 2 Safari plugins that Id have to recommend: InquisitorX and Saft. Ive had the beta version of Inquisitor for a while now, which was a Spotlight style autocomplete for the Google search feature. The new version adds a few extra features and Ive customised it to add a few search sites I use quite regularly. My only real reason for buying Saft is the crash protection, where by if Safari unexpectedly quits (which it is doing quite a lot at the moment) or if you quit Safari, when its next opened the previous tabs and their pages are restored.