Impact Factor

http://en.wikipedia.org/wiki/Impact_factor
High Impact Journals
http://www.sciencegateway.org/rank/index.html
http://www.icast.org.in/FACTOR.html
Ranking
http://www.eigenfactor.org/
How
http://www.editage.com/resources/article13.html
Limitations
http://www.jkscience.org/archive/volume93/Journal%20Knowledge/impact%20factor.pdf
Losing their Share
http://chronicle.com/blogs/percolator/top-ranked-journals-are-losing-their-share-of-top-cited-articles/31738
Tube
http://www.youtube.com/results?search_query=impact+factor
Global
http://globalimpactfactor.com/