Edit: You should probably just go here now:
http://forum.dominionstrategy.com/index.php?topic=17152If you're as fraught with grief as I am, then daily updates of the leaderboard at 00:00 UTC might not be enough for you. Or maybe you just want to receive numerical confirmation of your ability as a human more frequently than that? Well, regardless of the situation, I've built a tool to estimate your rankings at any time based off of your current ranking and the players you've played against.
You just have to keep track of the level of players that you've played and your results against them. Then you can go here:
http://dominion.lauxnet.com/rankings/ and enter your current ratings and those results and receive an estimate of what your new level will be if the rankings were to update right then and there.
New Feature: If you don't keep track of every game, you can just enter in an estimated number of wins and losses as well as your estimated average opponent's level, and still get an estimate.
The number won't be 100% perfect because in order to keep things simple you just enter your opponent's level and I estimate their mu/rating deviation from their level, but the results you get should be really close to what your actual update should be.
Again, that's
http://dominion.lauxnet.com/rankings/