Shopping-wise it's quite crazy in Japan at this time of year; the traditional New Year Sale started on January 1, and lasts from a few days to two weeks.
During this time, people actually make lists of shops to visit, and go at it as long as the shops are open.
Another phenomenon during this time of year are the Surprise Bags; a bag stuffed with goodies for a fixed amount.
Its contents may vary, but is always worth the purchase price, but most often a lot more.
A funny thing we saw on our way through Omote-sando yesterday; a really small shop called HAPPY HAPPY SMAP, with a queue from here to Rotterdam. Apparently, they sell a cd there, according to
Wikipedia, which is only available during a limited period of time.
Economics 101.
Cheers, K.