I'm not a big fan of folders for documents... but if users want them, let em have it.
@ kabelittile:
"Please forgive my ignorance (I am not a programmer), but if sub-tasks are possible, why not sub-documents?"
That is perfect to me. Custom properties for different types of files, yes!
Documents (imho) should be filtered in 2 dimensions, #1 access privileges (workspaces), and #2 metadata (Custom Properties).
Trying to organize documents with folders drives me crazy. Example, if there is a set of documents generated at regular time intervals, like weekly reports, one of the custom properties for that document type will be a date field. Otherwise, I'm 2 or 3 folders deep just getting to the reports, then there are 13 folders after 3 months, and 26 folders after 6 months, and them we start creating quarterly folders... It drives me crazy! I'd rather enter a couple of keywords and a date. Plus, if I want to look at data from 3 consecutive weeks, It's all right there.
I guess that's the biggest thing. Folders impose a defined structure on how the data is grouped. Like I said, to each his (her) own, If you like folders, I think you should have them. But I want sub-documents/custom properties!