I am borrowing my little brother's pocket pc with option to buy. I am wondering if any of you use these and what applications you use to be more productive in the field.

I am waitng for my trial version of the the latest version of quickbooks to arrive in the mail (I need the latest version to interface with the pocket pc) . Then I will load the trial version of quickbooks for pocket pc that will allow me to have all my customer contacts with me at all times. the features I look forward to most are the ability to enter recepts as I get them and invoice a job in the truck before I leave the job.

Any of you have experience with these? or can point to previous posts?
thanks!