I have been experimenting with Google Wave and so far am pleased with what I see. I am not certain how much this will be used for mobile learning, but was pleasantly surprised that it works on the iPhone (although there is a warning that that browser is not supported.) It can tend to be a little slow, but usable.
Here are a couple screen shots from my iPhone.
If you have a Google Wave account, please join me on a new public Wave I created to discuss mobile learning. You should be able to find it by title "Mobile Learning" or creator Judy Brown or judycb. I have not yet figured that out. ;-) UPDATED: I just added some tags and you should be able to find it by entering "tag:mobile learning" (without the quotes) into the search box and choosing Mobile Learning Public Wave. Hope to see you there.
Update 10/15/09: I have received emails that none of the comments work to locate this Wave. I just received assistance (thanks taylorkirk) and found that the following does work.