I tried to start a discussion the other day about Squidoo. Yes, I know the name is awful but it gets a lot of traffic and Google loves it. The offer a service that allows you to create one page websites with lots of interactive features. My post didn't peak anyone's interest so I'm mentioning it here.
Their catch is that pages that have lots of features and link to lots of other pages rank higher than others. I've been experimenting with building out some pages and having some success. Each time I add a page, my rankings get higher. It is a lot like a Group here actually but more interactive.
I recently added a page which does little more than republish our blog's RSS feed. It was fast and easy and has actually gotten some traffic. Since it was so simple (and free), I am hoping that others will be interested as well so I created a group for blog owners. Seems like the easiest and cheapest way to self promote.