The AMSAT News Service publishes weekly bulletins containing information of interest to amateur satellite operators. These bulletins are distributed electronically through amateur satellites, the terrestrial amateur packet radio network, and through various landline networks. The latest bulletin is available here.
In addition, John Magliacane, KD2BD, produces a weekly newsletter called SpaceNews. The latest issue of SpaceNews is usually available here.
Back issues are available back to August 1994:
Updated 8 Feb 1996. Feedback to KB5MU.