I don't think there's much I can say about this one other than that it was just something I noticed as I wandered along.

On a totally unrelated matter: we're currently having problems with our mail server – I can send mail, but not receive it – so if you need to contact me urgently please use the following address:

david.j.nightingale AT gmail DOT com

Update: my apologies for not posting anything over the last couple of days but I've been working on our latest tutorial. This will now be published some time during the early afternoon on Sunday.