So I’ve changed blog engine and, err, moved the OUseful.info blog to here – https://ouseful.wordpress.com/ – for now, though the Feedburner feed is still the same: http://feeds.feedburner.com/ouseful, and http://ouseful.info/ should always point somewhere relevant…
The old blog posts (that is, everything that used to dangle off http://blogs.open.ac.uk/Maths/ajh59) are all archived at http://ouseful.open.ac.uk/blogarchive, and links to the old blog should redirect posts there…
I did consider importing the old posts here, but I’m not going to… Fresh start and all that…
I do need to sort out a search engine that covers the old posts as well as the new, though, so I will probably go with something like a Google CSE (or maybe a Yahoo BOSS engine…?)
Anyway – aside from that, things will continue pretty much as before… or maybe not…
OUseful.Info, the blog... 
Interesting decision, may I ask why?
Not worried about the inability to embed lots of Flash content (e.g. widgets) at WordPress.com?
I opted for WordPress because I wanted a free hosted solution, and prefer the feel of it over Blogger…
There are some workarounds for embedding flash content (use vodpod, for example) but where I do want to link to interactive stuff (youtube movies aside) I intend to use screencapture images in the blogpost, with a link to the live interactive demo elsewhere (the thinking being, interactives are going to break… but the screen capture will persist…)
I’m not really one for lots of sidebar widgets anyway, especially as I’d rather nurture a subscription based readership…