To clarify: the Apple docs say the following:

Quote:You should not store user data files in the Library directory or any of its subdirectories.

The way I read it, that applies to /Library, not ~/Library. That is, don't pollute the system-wide Library. Then again, you might as well put it in ~/Documents which is more in line with the Apple guidelines, but personally I hate it when my meticulously managed Documents folder gets stuff thrown into it.

Also:

Quote:However, applications can create new subdirectories as needed to store application-specific data.

There we go.