Is Motorola for sale, looking to buy Palm, or is this just pure speculation?

So the rumor mill was brewing yesterday that something is going on at Motorola that could involve a sale of the business or even an acquisition of Palm. The rumors started after MOT CEO Ed Zander cancelled plans to deliver a keynote address at a conference. Speculation ensued that something big was going to happen at Motorola.

SeekingAlpha had nice coverage of all the possibilities here.