The iPhone SDK will be announce on March 6th. I am looking forward to see if we can take GoogleSky or MAST maps and add them to an interface the Space Telescope Science Institute will develop.
The first applications tailored for the iPhone should ideally be GoogleSky :) However, it does not seem to be as straight forward as I thought it would be.
In any case, Mike Fitzpatrick has already ported IRAF to the iPhone (!) and pushed the limit of VO for the iPhone: way more than anyone has done for mobile devices in the astronomical community, with the exception of Alasdair Alan.
So what could STScI bring to the iPhone? I have some ideas... stay tuned.