I got the most out of them by regularly visiting other members blogs.
I considered it manual labor and found it worth my time for the exposure they gave me.
Last fall, one of them closed down, and as of the end of this month, another one will be shutting down.
All three of them worked great together with the system I used.
Now it is down to only one.
And that one site is the oldest one, but it isn't what it used to be either.
I am really bummed that these two quality sites are no longer around.
If anyone uses any other good sites to promote their blogs, I would love to hear about it.