Here is a list of some of the important websites* related to islam:
http://www.islamyoutube.com [ Islamic version of You Tube ]
http://www.watchislam.com [ Islamic channels online ]
http://www.fosis.org.uk [ Federation Of Student Islamic Societies ]
http://www.islamicfinder.org [ Find lots about Islamic issues ]
http://www.islamicity.com [ Rich with info about Islamic topics ]
http://www.allahsquran.com [ All you need to know about the Qur'an ]
http://www.englishandarabic.com [ Teaches Arabic for English speakers ]
*watch out for new ones coming up soon..