Mobile application - after Greg Hintermeister's article reading

[Tomasz SkorÅa <t.skorza@xxxxxxxxxxx>]

Good afternoon

I read Greg's article very carefully 
(http://systeminetwork.com/article/designing-mobile-user-experience) - 
we just planning create such mobile solution for our salesmans.

I would like to ask you about your experience, your notices during 
similar projects? What is important?
We planning use it for about 50 persons.
We planning to use some data exchange server between mobile and AS400 
with Unix and mySQL database.
We thinking about HTC Hero devices.
We works on JDE World.

One question which pervade me - which solution of touch screen is better 
- with finger or with pen?

Every answers will be very helpfull.

Thanks and regards