Web 2.0 blog software

I brought this up in #redmonk, and sog suggested I stick it here and ask the LazyWeb for ideas. So here it is, with added capitalization and punctuation (no extra charge!).

There needs to be Web 2.0 blog software. The default blog page would show either just topics or perhaps topics and the first paragraph. Click, and you get a simple expansion or compression on the same page, instead of redirecting to a new one. This turns a blog’s homepage into effectively a featureful blog reader, especially when coupled with possibility of people logging in so you can track what they’ve read. Every time I see one of those annoying 1-paragraph things that trails off and I have to click to read the full post, I think about it.