Update for the one who originally asked the question about file management. I did try DropBox and, at this point, still prefer iDisk.
I am essentially using my Ipad as an input device for files I keep on my PC (Excel budget spreadsheet, Word docs) and documents sent via e-mail or printed directly via wifi to my HP C410a e-printer. To that end, Numbers and Pages both allow direct saving processes to iDisk from their menus (a biggie to me). Additionally, those programs automatically allow saving in a PC format (Word, Excel). When I get on my PC, I just access those file directly from the network drive via Explorer or right out of the application itself just as if it were stored on my PC (a copy is of course). It is a given that you must read and understand how to use it and you need to set it up properly, like any other app and process.
When I tried DropBox I found it didn't operate that way and was not created to serve users who create content on their mobile divices. If I'm wrong about that, I'm sure the more informed or experienced users will let anyone interested know pretty quick from what I've seen.
All I'm trying to do here is give the person who asked the question that started this tread my best answer based on my direct experience and hope it helps in some way. I will admit that I'm beginning to see Apple's logic...if you don't have a file system that allows the kind of flexibility we are disscussing, you are very unlikely to get bad stuff on your device (except possibly through corrupted apps).
In closing, some of you are pretty darn patient and I appreciate your knowledge and efforts to help us noobs, and some of you need to take some sensitivity training.