I have been exploring del.icio.us and tagging things that interest me. There are so many sites... but you can find nice photos and designs in del.icio.us and flick'r. Folksonomies is collaborative categorisation.
Web 2.0/Library 2.0 is about sharing information and keeping in contact. Many people I know, not only in the library, have joined either flick'r or del.icio.us, Facebook or any of the others. It is a good way to explore the Web. Also, if you find anything that interests you you can tag it. Tagging is something that libraries can take advantage of. I haven't added the Technorati code because I am not sure I like the idea but it's a pity because I like using html. I might do for something else if I have the time.
del.icio.us: http://del.icio.us/
Library 2.0: http://www.oclc.org/nextspace/002/1.htm