I decided to try My Web after seeing a link to it on search.yahoo.com and after trying Google's My Search History. The Yahoo offering is more substantial in that it allows you to save exact copies of pages as you stumble across them. So, whereas with del.icio.us where your links are bound to grow stale and stop working, you could always see what you saw using a stored copy in My Web.
Of note was the Firefox toolbar installer which worked flawlessly.