Wikisky.org is an awesome astronomy site that you will want to bookmark and explore. Here is a description of the site:
The brilliant work of mathematicians and programmers from SKY-MAP.ORG has enabled that company to achieve a breakthrough in the field of visualization of astrophysical information. The new version of DSS2 at WikiSky demonstrates both the technical and organizational capabilities of SKY-MAP.ORG. This statement becomes clear when you take into account the quality and the volume of work involved in the compilation of a new version of DSS2. Below are the snapshots of M74 galaxy, taken from WikiSky, Microsoft WorldWide Telescope and Google Sky. In all cases, the same survey – DSS2 – was used. However, it is apparent that there are significantly more details perceptible on the WikiSky image than on those of both MS WorldWide Telescope and Google Sky.