Yahoo finance:
http://finance.yahoo.com/

Briefing calendar:
http://biz.yahoo.com/c/e.html

International indices:
http://finance.yahoo.com/intlindices

Oil prices:
http://www.nymex.com/index.aspx

Futures:
http://www.cme.com/trading/dta/del/globex.html

Betting market:
http://www.intrade.com/