I have been looking into smartpens again. I carry the Livescribe Echo smartpen with me, which is useful for taking notes at meetings (and sharing pencasts with students), and use the Papershow smartpen for live and recorded presentations, but I am always on the lookout for something new. Apen’s A2 smartpen looks like something I would like to work with. There are four variations on the smartpen that the company sells, and the A2 is closest to my needs. The pen works with any paper (rather than the dot paper that the Livescribe and Papershow smartpens need), with the digitized content received by a combination of table-top device and a USB cable.
Anyway, I give a basic overview of how I currently use my existing smartpens here. I plan to compare some of the various devices on the market later in the year.