Each week Ross Rubin contributes Switched On, a column about technology, multimedia, and digital entertainment

The last Switched On discussed the innovative approach that Livescribe has taken in its core note-taking function while touching on some of the company's grander plans to create a wide array of applications and content, taking it far beyond its failed predecessor, the Logitech io2.

Livescribe is building an ambitious house in a neighborhood that has seen a lot of foreclosures; Pulse will need to rewrite history to be successful in the traditionally challenged smartpen market. Indeed, between the time that the Pulse was announced and shipped, Logitech announced it was writing off the market for now. In addition to improving on note-taking, the company points to the reduced size of the Pulse as being less obtrusive than previous smartpens and thus more appealing to use. One of the keys to smartpen use is that it is less obtrusive than, say, a PC using Microsoft OneNote, which also has the ability to synchronize audio to written notes.

However, the Pulse's OLED display offsets at least some of the gains made toward discretion by shrinking the pen's girth. Worse, to get the full benefit of the Pulse's cool ability to resolve conversations in a room using 3D audio recording, you must wear earbuds that contain embedded microphones. It's hard to imagine something that could be more off-putting to a speaker than seeing an audience member wearing earbuds, and it would engender curiosity when that speaker notices that they are connected to a pen. Fortunately, the Pulse does a very good job of recording even without the earbud-based microphones.

Each week Ross Rubin contributes Switched On, a column about technology, multimedia, and digital entertainment

If the pen truly is mightier than the sword, Livescribe's Pulse smartpen ($149 with 1GB of flash memory, $199 with 2GB) may be able to take out a tank at 50 meters. Arguably the most technologically advanced writing instrument not intended for killing a Bond villain, the Pulse includes an infrared camera (for recording text), dual microphones, a speaker, a headphone jack, and an OLED display that can even play back short "movies" (animations synced with sound). And it manages to pack it all in a pen size that, while still a bit thick, is relatively comfortable and thinner than its closest technological ancestor, the now-discontinued Logitech io2.

Using its noise-canceling microphones and ink recognition system, the Pulse can be used to either take written notes that are uploaded to the PC, or record audio. But its greatest advance for note-taking over previous smartpen systems such as the io2 is the ability to synchronize written notes with audio. Simply put the pen into "Paper Replay" mode and tap on some text to hear what was being said as you scribbled. The result is the next best thing to real-time transcription. It can be used to check what may be an unclear or hastily scribbled note, focus on commentary while the pen captures the content, or create or copy a diagram while it is explained via audio.

But first, whatever is being written will have to be done so on paper designed explicitly for the pen. Like previous products that use Anoto technology, the Pulse needs smart "dot paper" to make transcription work. Without a doubt, this requirement will be a deal-killer for many, and limit the Pulse's everyday utility for some time to come. In contrast, simpler products such as the IOGear Mobile Digital Scribe uses ultrasound to track a pen's position and can be used on any paper (and the pens in such systems are smaller as well). To make dot paper more readily accessible, though, Livescribe will offer a template that should allow many customers to print their own dot paper at home. And dot paper enables the Pulse to pull off some pretty slick feats. Read on.

It was a long day at WSJ's D down in San Diego, but there was plenty to see. Check out our coverage roundup below.

Live coverage
Steve Jobs and Bill Gates: Historic discussion live from D 2007
Steve Jobs live from D 2007
Steve Ballmer live from D 2007
Palm's Jeff Hawkins live from D 2007

Apple
iPhone to get third party apps
Apple TV gets 160GB disk... and YouTube too
iTunes Plus and EMI's DRM-free music hands-on
iTunes Plus DRM-free music now official(er)

Microsoft
Microsoft Surface - surface and gesture based computing lands
Microsoft Surface hands-on

Palm
Palm Foleo hands-on
Palm Foleo gallery
Palm Foleo announced

Etc.
Livescribe shows off Leapfrog Fly-esque pen computer for grown-ups
QiGO announces Internet Content Keys

Also, you reminded us that you're a hell of a clever lot that not seemed to think we were justified in totally panning Palm's new Foleo. So here are some of the top nicknames we've heard it given:

1. Foolio (totally our favorite, by Jeff)
2. Folly-o (by derF)
3. The Palm Shark Jumper (by Brian)

Feel free to leave some more in comments!