Just wanted to chime in. My wife hasn't worn her rings in more than a year. She always took it off when I had a porn addiction episode. I have had mine on forever except for a period when it was damaged and I had to get it fixed.
During the earlier part of the separation I kept my ring on, but took it off when I figured my wife might see this as my denial or that I see this situation as something that will blow over (just like the other occasions in years past).
After about a month, I got some advice from friends and people here that by taking off my ring and, more crucially, combined with a mistake I made by opening a free Match.com account (which my wife discovered via one of her friends), my wife may think that I truly don't want this marriage anymore. Needless to say, my ring has been in it's rightful place since then. I hope that in the near future it'll mean something more than just a current personal statement.