SharePoint Dragons

NTFS Alternate Data Streams allows you to create multiple data streams for a single file. This allows for the possibility to specify metadata such as access rights, date and time info and such. The cool party trick (if you have a somewhat geeky audience) is that you can use it to hide text in Notepad: http://www.codeproject.com/Tips/214552/Hiding-Text-in-Notepad.

The downside of NTFS Alternate Data Streams seems to be that the SharePoint crawler doesn’t play nice with it: http://social.technet.microsoft.com/Forums/en-US/sharepoint2010setup/thread/c3699c7b-1c38-4769-b5f8-07170475874f