On the one hand I think it would be neat. It would be a start on creating a list of X that I've played/read/watched/etc. It would be useful for comparing notes and possibly as conversation topics. Lastly, it would also be useful to give friends an idea what items they could borrow.
On the other hand, it would be revealing a lot of information to the general public. It could potentially paint me as a target of opportunity for robbery. I don't think that's all that likely, but it's still something that concerns me.
I wouldn't have to publish the full list to the general public to get some use out of it, though. At the very least it'll be good to keep a personal record in case something happens (a fire, etc). It would also be useful to selectively show it to friends so they know what movies I have, or whatever.