E-readers seem to be smoking hot this year. The Amazon Kindle, of course, has been leading the pack, but Sony seems to have sold more than a handful as well, and its new Sony Daily Edition e-reader may be in short supply. Meanwhile, newcomer Barnes & Noble already sold out of its new Nook e-reader, which the company just announced a month ago — and that’s only pre-orders that aren’t shipping until the end of this month. Order a new Nook now, and you’ll have to wait until January to get it. Sounds a bit like Amazon’s first sold-out holiday sales effort with the Kindle.