gosh a quick google search on Calvinism and Arminianism threw up some good results.

http://www.fivesolas.com/cal_arm.htm (a basic summary of the two positions clearly stating the major differences)

http://www.gotquestions.org/calvinism.html (the articles on this site are quite simple... but they have scritpure references and are easy to follow).

These two alone make a much better start than the article you referenced... have a look at them and let me know what you think.

Blessings
Cat.