I'm another one who agrees with the comments on Apple's approach (or lack thereof) to file storage. If Steve Jobs' prediction of a computer demise is to be taken seriously, there HAS to be a way to organize files in a user-friendly manner. This has been an essential basis for computer development all along and exists in almosts every other device outside the Apple empire.
I love my iPad2 and would willingly dump my desktop and laptop to use just the iPad2, coordinated with my iPhone - a blockbuster combo. It's so convenient and capable, and I've given it serious consideration. But it's an impossibility for someone who needs a total-use computer for the workplace. The absence of any functional method to organize files by client (or any other category) is fatal. While Dropbox is a workaround, it's extra steps that shouldn't be inflicted on people use to creating their own organization independent of web clouds.
The file system is only part of the problem. Other aspects include no USB or eternal drive interaction. You can't label photos - for graphics work, an impossible situation. You can't access websites that use flash. And on and on. Apple builds in severe limitations to professional, flexible use of the iPad.
I TOTALLY agree there needs to be some re-thinking of what role the iPad is to play in daily life. Are they aiming at the casual user only? Or force use of job-specific apps? If so, they are wildly successful.
But if it's the stated broader goal, a paradigm shift is needed. IMO, the public has become increasingly tech savvy, and will continue to grow in this arena - not go backwards, accept limitations once common in the early days of computers, and ignore the fact other devices are very capable.
Users can't be expected to muzzle their capabilitites and MUST have flexibility in their devices.