Windows Mobile and Ajax. Oh yes.
Now the very interesting thing about Ajax is that it actually makes a huge amount of sense of on a Pocket PC, where firstly, the user could also use a helping hand when filling in data with smaller screens and little keyboards, and secondly, over typical wireless connection speeds, everyone could benefit from sending smaller lumps of data to update a page, rather than generating an entirely new page and sending that.
In fact, the more I look into it, the more I think that Ajax is a wonderful new way of creating mobile applications for Pocket PCs and Smartphones. Ajax and mobile devices? It's a marriage made in tech heaven.
So, for MEDC, I started working with Randy the Ajax-guru here, and we pulled together some information and links, and put them on the Windows Mobile Developer Wiki. Also, in the UA team, Steve the IE Mobile writer, made a huge push to get the documentation object model completely written-up, and that makes a huge difference.
I hope you take a few moments to read about how Ajax is a pretty cool way of thinking of applications, and how it really is something worth exploring on a mobile device.