Here are some links to web sites with data sets 

 
https://perswww.kuleuven.be/~u0018341/datasets.htm

http://www.stat.wisc.edu/~yandell/pda/data/    
and click on real data sets

Statlib has a Data Archive that links to other pages (DASL, ASA, etc... ) with more data sets, but it has its own 
archive of data sets. Go to this link below and click on the left on "get data"   
http://lib.stat.cmu.edu/

Another good source of data sets is the Journal of Statistics Education. There, they have a section in each issue 
where people submit a data set and analysis on it. If you go to 
http://www.amstat.org/publications/jse/jse_data_archive.html  
you will see them.