I run a small construction company. My phone (and previous to smart phones, my palm pilot and my mobile) is my office. I receive sets of plans, small but do-able. Emails, taking photos and videos of job sites (record everything, then you have evidence if there is a dispute over anything). Keeping in touch with employees. Ordering materials, both by phone and internet orders. Prime contractors send me excel sheets for schedules. I live and die by the calender, sometimes I wonder if I control it, or if it controls me. Weather is important in my industry, so I check that when scheduling. I use an app called SmartTools for estimating and measuring up jobs. Gtasks is my never empty todo list, I have 7 different tabs to try and keep things organized.
I do like the HTC, and it is fun, but well over 90% of my phone time is work related. There are down times, when waiting for a client or some such delay. Thats when its nice to have my Kindle book, or perhaps some Angry Birds