Good news for fans of OpenLayers it looks like they are working hard on adding mobile support to the excellent web mapping api. I have looked at using some patches for openlayers to add mobile support and it worked quite well but it is great to see official support for device being added. Together with the maturing jquerymobile it will be possible to do some slick geo mobile applications quite easily and quickly.
We have done some experimenting and development with mobile GIS drop us a line for more info.
A tenuous link ( I am not too sure how much McAlmont & Butler care about OpenLayers) but any excuse for a classic tume