Social bookmarking at del.icio.us is a tempting waste of time! (See also Spurl.net.) You can use del.icio.us to avoid a trail of bookmarks, never where you need them, on different machines and between different browsers. Even better, you can assign tags to each bookmark for grouping into like categories. Of course you can browse all, browse by tags, and search. And as icing on that cake, you can explore what other people bookmarked who bookmarked the same link.
Cocoalicious 1.0b36, BSD open source, is an OS X (Cocoa) application interface to your del.icio.us account. You can create and browse your bookmarks. Since it caches the data locally, you can save some rendering time.