Galaxy Info

http://www.newton.dep.anl.gov/askasci/ast99/ast99351.htm
A scientist from the U.S. Department of Energy says radio observations are the best way to map out our galaxy.
http://www.astronomynotes.com/ismnotes/s4.htm
Provides a basic description of the interstellar medium and galactic structure.
http://en.wikipedia.org/wiki/Large-scale_structure_of_the_cosmos
Outlines the basics of the structure of the Universe.
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/060915a.html
NASA's "Ask an astrophysicist," much like the link above.
http://www.astro.washington.edu/larson/Astro101/LecturesBennett/Galaxies/galaxies.html
Details the classifications of galaxies. Good link.
http://www.universetoday.com/2006/07/27/the-largest-structure-in-the-universe/
Discusses the largest structure in our universe yet discovered, which is over 200 million light-years across.
http://en.wikipedia.org/wiki/End_of_Greatness
Short wikipedia article on the "end of greatness," where at approximately 100 mpc, structure appears more random.
http://astro.berkeley.edu/~mwhite/probes-lss.html
Lists past, ongoing, and future deep space surveys. Also provides information as to the structure of galaxies in the universe.
http://www.space.com/scienceastronomy/astronomy/molecular_cloud_000320.html
Explains the phenomena of gassy clouds in the aftermath of galactic collisions, notably Centaurus A.
http://www.noao.edu/outreach/current/collide_hilite.html
Explains the process of galaxy collision, using NGC 6745 as an example. Interesting.
http://hubblesite.org/newscenter/archive/releases/1997/34/image/a/
Quicktime movie presenting the collision of two galaxies, NGC 4038 and 4039