I would love to create some database diagrams like this one with Visio but I can't find any templates at all for that kind of notation. The example I linked to was apparently made in Photoshop, which sounds like a terrible way to make ERDs. Are there any good Visio templates for this sort of thing?(I have Visio 2010 Pro, by the way.)
Entity-relationship model diagrams in Visio
database design;visio
If you want to create a diagram like the one you linked to, then you need to find a Chen ERD shape pack.  You can check the following site: http://www.visiocafe.com/various.htm . Specifically try http://www.visiocafe.ca/downloads/various/DanielHarris/Chen_ER.zipedit: I don't know if that specific pack will work with Visio 2010.  I've never used it.