I got this really cool idea. Say you just put a new feature on you server or want to have a new rules noted, or otherwise need to get information across to your users. You post it to the server blog, which is an ingame, basic blog. As an admin or owner, you could post new news. When someone logs in for the first time that a new blog post has been made, it is shown by default to the user. However, when the post has already been seen, it is hidden by the user unless he/she does a specific command to view it. Anyone like?
I had this exact idea and was going to do it after I did my MobBounty plugin! Seeing as there is a demand for it. I will do this before I start work on the update for MobBounty.