In just a few short hours yesterday, AGI's Todd Smith reworked an example application that he created to function as a UARS overflight tool. Built using Esri's ArcGIS Silverlight API and AGI Components
for Silverlight, you simply click on the map to know when the UARS satellite is flying over. You will need to create an agi.com account
to access it. Click the image below to check it out.
If you want to build something like this yourself, you can download AGI Components for free here
If you aren't looking to build a tool, you can download STK for free here.