I have probably a few hundred datasheets and app notes that I've collected for all sorts of parts in projects I've worked on.
Previously, I used to keep these on a basic network share sorted maybe 2-3 folders deep by rough category, but then Google Docs added a PDF reader and the ability to upload them, so I tossed them on there. The "folders" are more abstract (a la Gmail categories), so you can put a datasheet into multiple folders (e.g. a voltage regulator also could go into LED driver folder or under the manufacturer), though this has some limitations, such as searching for text in large documents only shows the first few, and of course, dependency on an internet connection.
What other methods are there to store hundreds of datasheets/PDFs in an easily accessible manner? Would it make any sense to use some sort of VCS?