Ron George, an interaction designer, recently posted a comment on my blog. So I visited his blog and found that he has a great set of resources that many of my readers would appreciate!
For starters, take a look at Ron's Interaction Design Toolbox page, and then spend some time browsing around the rest of his site/blog.
Ron works at Microsoft on a team that is exploring Natural User Interface/Interaction (NUI). He previously was on the Surface team.