Our home galaxy must look rather like Andromeda, a neighboring spiral galaxy.

http://www.ipac.caltech.edu/wire/beginners/index.html
NASA's Wide Field Infrared Explorer: look at the slide show for fantastic pictures of different types of galaxies.

http://www.ipac.caltech.edu/wire/images/sp-andromeda.gif
The Andromeda galaxy

http://amazing-space.stsci.edu/hdf-top-level.html
Amazing Space "Hubble Deep Field Academy" lets students take on the role of scientists and use HST photographs to estimate numbers of stars, classify galaxies, and estimate distances.

http://oposite.stsci.edu/pubinfo/SubjectT.html
Space Telescope Science Institute: images taken by the Hubble Space Telescope, organized by topic. Click on the links for information about each picture.