Squidutils. But I recently read that Google may view republishing your posts (lenses) without making any big changes as an attempt to cheat the system, and, therefore, penalize the publisher for it. Also, I would advise against any drastic changes to a lens that gets a steady traffic from Google. A small change may cost you some visitors. A good example is my Best Gifts for 2 year old girls lens that was getting a steady 100 to 150 visitors per day until I made a few changes. The daily traffic dropped to under 50 visitors a day. And, since I didn't backup the lens in any way, I haven't been able to revert the revisions I made earlier.
So what's a good rule for keeping lenses fresh without overdoing it? I think that adding new content frequently is extremely important the first few months after you publish your lens. Add new modules, new links, improve your lens, establish your authority on the topic. By frequently, I don't mean every day. Maybe a couple times a week? Then, once you are seeing good traffic, I think it's a good idea to slow down with the updates and only update lenses a couple times a month. The technique seems to be working for me, but you might see different results if you are working with a different niche. Please do tell me what you think. How often do you update your lenses?
Have a productive day on Squidoo! Happy Tuesday :)