I have taken part in Tweet Swap over the past year and I always found only high quality tweets on creative arts, art and design, photography and such listed for sharing.
The way it works is that you add your tweet to the share list, then select 2-3 from the list to tweet to your followers. Others on the list will tweet your tweet.
This is Zoltan’s project and he just sent out this notification–
Hey guys, just a quick note to let you know that we now have a simple Register Interest page up for a dedicated, proper version of Tweet Swap.