I've been using Twitter at work with a team in different locations and have thought about whether it would be any good for conditions reports at our crags.
For example, one of us could set up Tor_Conditions or Malham_Cove_Conditions as a Twitter. The clever thing is that anyone can send an SMS, email or Twitter to Raven_Tor@replies and it would appear in the Twitter in an instant.
Waddya think...?