When I was (much) younger, and before today's technologies existed I had every number I needed memorized (50-100). I still remembered many of those numbers well into my thirties, long after they were of no use to me any more (and before the technology took over).
The devices we use today are very helpful in our personal and business lives, but in the long run dumb us down to the point we can't function without them.
It's sad to say, but I can only recite 2 numbers from memory today and they're both mine. I have a good memory and better recall abilities, but with the ease of these devices, it pretty much makes us lazy. Sometimes the old ways are better and should be utilized more. If I had to call any family member today and didn't have my phone, I would be screwed.
Currently, I am developing my own app to use for quoting and B&A pictures. Ultimately I'll be able to transfer any information collected back and forth between my iPod Touch and PC. Actually remembering the customer and the details of the job(s) will still be on me.