I've been using delicious2Safari for a while now, and it's a really nice (and free) way to integrate your carefully tagged folksonomies from del.icio.us into your Safari bookmarks.
![](http://www.darcynorman.net/images/delicious2safari.jpg)
Combine that with Safari Stand, which makes an extremely useful bookmarks search utility only an F4 away, and I've got a very handy offline cache of del.icio.us bookmarks.
I've also got a shortcut in the Sogudi extension to Safari, so all I have to do when I'm online is enter "del whatevertagiwant" in the location bar of Safari, and BOOM - my del.icio.us bookmarks with that tag.
Very handy loose integration of small pieces.