With the blog now structured the way it is, with chronological posts organised by day, I am adding titles to far fewer items than I ever expected.
Each day is designed to read down the page and can often be taken as a whole; titles only serve to break that up and ruin the flow.
Some days this works better than others, when the posts are more a stream of related comments. Some things, however, need to retain their titles such as the microcast episodes.
It's fascinating seeing how the approach to blogging has organically developed and continues to change in response to a few design decisions. It's not always a conscious choice, things just seem to happen automatically as they become the best fit based on what's already there.