This is the best daily SERP Tracker on the market. It's easy to use, minimal, gorgeous and it functions like it should! It can be modified to your liking and should not be difficult to mold it into an hourly or weekly SERP tracker, if that's what you prefer. Please click on the 'Campaign Manager' link in the upper right hand corner when you are ready to start creating your campaigns!
Also, if you haven't already - be sure to do this, this and that before getting started with your campaigns.