Thanks for pointing that out Mark - not tried it, but it looks interesting. The pricing is a bit steep for something that still seems a little untried and tested but maybe I've just gotten used to iPhone apps being pretty cheap compared to just about any other software.

One of the best shops in Munich for Heuers have got an app out now:

http://itunes.apple.com/de/app/meertz-world-of-time/id386042730?mt=8

Looks to be pretty much a repeat of the website in portable form, but it's free anyway and might get more functionality later I guess.