I usually use the “queue” feature to post here: I add to the queue whenever it’s convenient, and Tumblr publishes one new post every hour for as long as there are queued posts.
Queued posts should be published with a timestamp that reflects when they were published. Over the last couple of weeks, an increasing number of queued posts were published with a timestamp that reflected when they were added to the queue, or a timestamp that seemed to have no connection to any actual events (I don’t go on 4 AM posting sprees). Though I kind of dug the randomness, this did make the web version of the blog increasingly hard to follow (the RSS feed was OK as long as you ignored the ‘posted at’ notices).
I understand that Tumblr is working on the problem, and for the time being I’ll be posting everything real-time.