Well, things have not gotten better. I've been running this site since 2004, and there's been a very predictable pattern for seasonal traffic.
From the time I added an online store, January has always been a good month. This month is 25% to 30% of 2011, 2010, 2009 or 2008. This is more like July or August, which worries me about what the typical slow months will bring.
I've upped my Adwords spending, but people aren't even clicking the ads. Keywords for organic traffic seem to be about the same, although I haven't examined them in depth.
This one is a mystery.