Lisa - Awwesome post! My favorite is tribe syndication where I have been able to meet and connect with so many great people - like you and also benefit for the blog traffic.
And don't forget article marketing and guest posting. Both of these have brought visitors to my blog. I wrote an article abut the top 10 photography books. One of the author's mentioned it on his blog, and the next day, I had 1500 unique visitors. Woo Hoo! Other people sending visitors to my blog! I'm fairly new to content syndication. But I'm liking what I see so far.