I have a Livescribe Echo Smartpen and love it and find it to be very useful. The Livescribe smartpens are pretty cool. They record what you write, and hear, and then you can load this into your computer to keep a digital copy of your written notes and even share your notes with others.
(full review here)
The model I have is an 8GB pen. You get the desktop software, stylus tip, two ink cartridges, the cable, a starter notebook, and 500MB of personal online storage. The 8GB Echo retails for $199 so it’s not cheap, but it is another tool that can be very useful in education, business, and even just for taking personal notes. The 2GB pen is only $99. There are discount prices available to educators, anyone interested can email email@example.com for details.
UPDATED PRICING : You can get 15% off the price of a Livescribe Pen by using this link (directly to Livescribe, not secondary vendor)
CYBER MONDAY PRICING: The 8GB Echo is on sale for $99.95! Huge savings and if you buy one before January 31st 2012 you get a year free to Evernote Premium!