I hope to be able to provide some updates this evening as the Spirit MER makes it's descent and landing (and hopefully phones home). If you're interested, do check back here periodically throughout the night, starting at about 8PM PST.
If you want to keep an eye on the sites I'm watching for updates, NASA TV, marsnews.com's Mars NewsWire, spaceref.com's Mars Today, and the JPL MER website are all good sites to bookmark. Other good resources are Space.com's Mars Rover Report, NASA's MER resources, the Houston Chronicle's Going to Mars special report, BBC NEWS' Sceince/Nature section, and Google's Mars Directory.
We're 5 hours away. Stay tuned.