It turned out that the first version of MT::PastEntries was riddled with bugs that were quietly filling up my logs, so I’ve just released version 0.2. This version has been tested on a small blog of three entries and worked as intended.
I suspect that on a blog of any size it would add considerable load when rebuilding static pages, so I’m going to move on to writing a PHP/Smarty version asap. Gavin suggested looking into integration with the ExtraFields plugin, so once the PHP version is in place that’ll probably be next on the ‘to do’ list.
UPDATE: I’ve had a first bash at the PHP side. I’ve not done any debugging yet, but for those who want to have a look, the whole lot is available here.