Although my search of "hikes washington" brought more sites in Google than Del.icio.us, some of the first ones listed were the same. An interesting aspect of the retrieval was Google listed Washington state sites before Washington D.C.; whereas, Del.icio.us listed Washington D.C. first. The tags can help you refine your search by listing other terms.
It was very easy to set up an account and add web sites. I can see this is an easy way to create bookmarks. The capability of accessing the site from any computer makes it appealing.
SIL has already taken advantage of bookmarking. I'ved used Del.icio.us/silweb many times in helping patrons at the reference desk finding answers, for example, for consumer info and gardening questions. I noticed a new site, "Superstar Investor's Directory," was just added today.