1. Believing that there is only one God and that Mohammad is the messenger of Allah
2. Praying
3. Giving Zakat
4. Fasting Ramadan
5. Haj
Thank god I did them all
more information on Islam fundamentals can be found here
http://www.islamhouse.com/p/49766
And you also forgot that there are belief fundamentals and her is a useful link
http://islamtomorrow.com/beliefs/