Servicing Mission 4, also known as STS-125, is on pad 39A at the Kennedy Space Center and is nearly ready for launch.  NASA has scheduled liftoff of shuttle Atlantis for 12 May.  A second shuttle, Endeavour, is being readied and will roll out to pad 39B on 17 April (its purpose is to be available as a rescue vehicle if there is significant tile damage during Atlantis' launch.)
This ambitious mission will upgrade the aging space telescope, aiming to keep it in service and doing science until ~2013.  Let's hope so, as this is the final mission to Hubble.
I can't think of a single scientific instrument that has returned more information than Hubble.  Link to Hubble gallery.
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