NASA is providing very brief updates on the reentry of the UARS satellite. They also published an extensive study of the Re-entry and risk assessment for the NASA Upper Atmosphere Research Satellite (UARS)
The Planetary Society Blog has some nice coverage and a graph of altitude over time: Keeping track of UARS' reentry
The well-known satellite tracking site Heavens Above site provides UARS - Visible Passes data which seems relatively up-to-date, but without information on the uncertainty.
What I want is actual tabular historical data, e.g. the changes in the Orbital elements over the last months, weeks or days of its flight, and a characterization of how those elements other than altitude change over time.
Update: The Center for Orbital and Reentry Debris Studies has a prediction and map for UARS orbits.
Update 2: One authoritative source is Space-Track, run by United States Strategic Command (USSTRATCOM), but you need to be an "approved registered user"....