I am astounded at how fast this space is maturing. I found 6 potential competitors yesterday alone!
Now I am finding so many newcomers to this space it's astounding. For example Squidoo (blog) (article). Their primary goal is to help users create lenses. Here is a kayak fishing lense. The community clearly has a huge need to learn how to make lenses, so they have a uni and a MIRC chatroom.