How are you harnessing Twitter in your presentations?

The more mainstream Twitter becomes, the more chance that there will be Twitterers in your audience.  Is your presentation worth tweeting?  How will you cope with the seeming inattention?  How will you harness the power of this phenomenon in your presentation?
Olivia Mitchell as given us an excellent 8 key points on presenting live to a Twittering audience.  And Laura Bergells at Maniactive has added 2 useful ones of her own.
What do you think?