Since the iPad launch on April 3, TiPb's been getting tips about desktop/dashboard/widget-style apps being removed first from the iPad App Store, then from the iPhone App Store as well. There are a number of examples, some well known by now, some relatively unknown. The commonality between all of them is that they've tried to somehow make the iPad or iPhone into a Mac- or PC-like screen filled with mini-apps like browsers, email clients, calculators, weather, etc.
Some look almost exactly like Apple's Mac Dashboard, other like Windows of various flavors. Others don't look like desktops at all but rather place widgets on top of photos or other, more specific backgrounds.
Devs have worked around this by using a much more restricted metaphor, like a double tiled display, or by going the Jailbreak route, or they haven't worked through it and just gotten frustrated at the opacity of the App Store review process and not known how to proceed.
I can't claim any special insight or information on this, but my best guess is that Apple is removing (or advising they will be removing since not all of them have been pulled yet) the apps for the same reason they originally didn't include cursor (arrow) keys on the Mac. It's a pretty well known story and one that's been used a few times in different commentaries on the iPhone and iPad and Apple's direction thereof, but it bears repeating.