In the March 2009 issue of Astronomy, author Steve Coe listed and described 11 galaxy groups that make great celestial targets. Following are another 10 such groups. These galaxy groups and clusters, especially Abell 2151 (one of my favorites), will keep you at the eyepiece for hours of pleasurable observing.
More galaxy groups to observe
Add another 10 to the list from "Discover galaxy groups and clusters."