Ok, so this would be tough, and definitely a not-for-profit type venture, but I would love to see a digg.com type site for Christian sermons/blogs. This idea started from a post by Guy Kawasaki, on the sermon 'Jesus and your Job.' It was a great sermon, definitely worth listening too.
I want a site were users can link to their preacher's podcasts, tell what the preacher was saying, display bible versus used for the sermon, rate the sermon etc. etc. etc. If you build it, I will come.
In the same fashion as Guy, I would like to share the most recent sermon at Illuminate at Overlake Christian Church in Redmond, WA. Mike Howerton, the leader of Illuminate, a service where 'we don't take ourselves to seriously, but we take God seriously,' speaks about the foundation of Illuminate (which turned 2 that day), and where he thinks Christ's Church should be going in the future. Worth listening to.