No bandwidth, no servers, no infrastructure, no money required. Just a bit of python and a tad of javascript and you can live stream an event to 10.000 people concurrently (theoretic figure, Analytics said the live-blog site had 30.000 visits in all) within Google App Engine's free quotas.
This is the graph taken from my App Engine dashboard the morning after the WWDC'09 Keynote after MacBidouille.com live-blogged the event in French through my application. We always had scaling problems while Google's infrastructure was in beta and we were bound by smallish quotas, but since they opened fully the service a couple months ago, the sky is the limit.
which will enable you - if you are ok with thrusting an exacto knife into your iPhone's entrails in cold blood - to change your battery with a new 1600mAh one (compared with 1150mAh for the original).