Office + iPhone
Face it. People don't buy iPhones to actually do work on. If you want an office device you buy proper smartphones, PDAs or laptops, where you have a real filesystem and application support to load proper office apps and be able to edit their files without having to go online all the time.
It probably makes more sense with the iPhone to use Google Docs and just edit everything online.
Keep the iPhone for the sexy looks, sleek UI, and impressing colleagues.