"DESIGN BUSSAN NIPPON", a exhibition about Japanese traditional x modern design (will finish on Sept 1.) displays a very good example of iPhone/iPod touch as an exhibition guide.
If you have either device, you should check out the following URL:
It is a bilingual guide (i.e. Japanese + English).
You will be surprise to find, how they have even optimized the size of movies.
The exhibition ends within 24 hrs. but I hope this site would remain as the model example.