old media analogy:
television. radio.

comments:
live = instantaneous streaming media.
near-live = frequently updated non-streaming media.
time-shifted = archived media.
the more live, the more addictive (ebay, IRC, US election results).
regularly add content for "bookmark-ability."

examples:

• net radio/ streaming media
  (live, time-shifted)
• ebay
  (live, many-to-many)
• online interview in chat room environment
  (live, time-shifted, many-to-many)
• photoshop tennis
  (near-live, time-shifted, multimedia)
• wirefire, [screen shots]
  (live, time-shifted, multimedia)

>>>