Use of iPods and other Mobile Learning

Not sure if this came from the same person, but I saw a question posted on TrDev and was sent to me via Yahoo 360 that covered the same basic topic: How are iPods and PDAs being used in corporate learning applications?

The unfortunate answer is that it's doubtful that any numeric answer exists for this, but there are lots of examples out there. Some places I would suggest you look to get a sense of what's going on:

• Judy Brown's mLearnopedia or the associated content community for mobile learning.
  
• Blog summary of a recent presentation by Judy Brown
• Lucy Carter's presentation about Sales Training at Apple

Search under "mobile learning" and you'll find a ton of stuff.

If anyone knows a source that will give us an idea of "how much this is happening" - that would be great.