I usually find that things I bookmark for later consumption, are rarely read. Unless they apply to something technical that I implement and read up on later.
I use instapaper for articles I really want to read. The tilt to scroll is amazing. It might be my favorite way to read.
I use Camino so it's happened to me once or twice. I used the history listing to find them again (camino lists both the first and last visits to a given URL, a bunch of URL grouped together with identical last access and first access widely different both from one another and the corresponding last access points to the URLs loaded the last time I launched the browser e.g. after a restart)
Instapaper gives you your saved links when you have nothing else to do (e.g. commuting), and this makes a huge difference.