Attached Properties spreadsheet
Dr.WPF contributed a spreadsheet he compiled by himself. The spreadsheet listed all the current attached properties in WPF framework. It is definitely a good reference!
I uploaded the spreadsheet as well, for backup purpose. Because of the file extension limit, I have to change the extension to .doc. You can just change it back to .xls after you download it.
A good tutorial about how to write and use attached property