I use Safari for day to day browsing. The only thing I miss about Firefox is the ability to load it up with useful extensions. Safari does have a few nifty add-ons available though. One of those is Concierge.
Concierge adds simple drawer to Safari that can be used to manage bookmarks, collect links or simple text snippets (called notes.) It also shows your browsing history nicely collected by date and/or domain.
I use the Scratchpad tab instead of Del.icio.us for saving links to sites I run across and want to find later. All three tabs, Scratchpad, Bookmarks, and History are quickly searchable has well. It’s handy.