Today is the autumnal equinox* - the halfway point between the summer and winter solstices. Night and day are of exactly equal length, and the sun set due west this evening. We won't be seeing this much daylight again until 20 March 2012... sorry. In fact, it's all downhill from here until 22 December.
I think the only sensible course of action is to throw yourself enthusiastically into the process of snuggling down for the winter. You might do a bit of knitting (with real wool), make sure all your quilts and blankets and jumpers and thermals are clean and ready for action, fix your draughty windows, and enjoy some warming seasonal foods. All of that, and get outside whenever the sun shows itself - or even if it doesn't.
*: Assuming the Blogger stats are not a total fabrication (and this week the stats say that at least two readers have come to my blog via a baseball cap shop in Indianapolis, so they might well be), some of you are probably in the southern hemisphere. Hello, Brazilians, Australians, New Zealanders, and South Africans! Of course it's your spring (or vernal) equinox today. Have a lovely summer and come back to read this miserable message in six months' time!