M4 (and NGC 6397) from Chandra; April 28, 2008:
http://chandra.harvard.edu/photo/2008/gclust/
M31 and M101 by Galex, February 21, 2008:
http://www.galex.caltech.edu/newsroom/glx2008-01f.html
M81 from Chandra; June 18, 2008:
http://chandra.harvard.edu/photo/2008/m81/
M81 group (in particular, Arp’s Loop), from Hubble; January 8, 2008:
http://hubblesite.org/newscenter/archive/releases/2008/02/
M81 group with radio clouds, from NRAO; January 10, 2008:
http://www.nrao.edu/pr/2008/m81clouds/
M82 in X-rays by XMM Newton:
http://xmm.esac.esa.int/external/xmm_science/gallery/public/level3.php?id=1004
M83 by Galex; April 16, 2008:
http://www.galex.caltech.edu/newsroom/glx2008-01r.html
M106 by Galex; April 28, 2008:
http://www.galex.caltech.edu/newsroom/glx2008-02f.html
Various THINGS galaxies, including M51, M63, M74, M81 and several M81 group dwarfs, by NRAO; January 10, 2008:
http://www.nrao.edu/pr/2008/things/