There’s definitely a strong value proposition for blog owners who are thinking to switch to a stream - it’s maintenance free. No more writing blog posts! That value doesn’t translate into audience value so well, though. I think my audience quickly got bored of seeing blurry food snapshots or out-of-context quips from my Twitter feed. Your mileage may vary.
Why Posterous instead of Sweetcron - Yongfook’s posterous