Sample syllabi for job application I'm applying for faculty jobs and was considering including sample syllabi for courses I could develop (which are currently not offered at the target institution). My idea was to include them as an appendix to my teaching statement.

Would this be a good idea? Are there any pitfalls I should look out for? 

In particular I'm thinking for US liberal arts colleges, but I would be interested in views for more research focused universities as well.
I take it that the position you are applying for don't specifically ask for such samples. In some cases, hiring committees will look at only what is asked for, nothing more. This is to protect the commitee's time and to ensure that each candidate is considered in equal light. While you likely won't be penalized for offering more, don't be surprised if the extra pages end up in the trash can before the committee sees them.