"To worry about the duniyah leaves a shade of darkness over the heart and to worry about the akhirah illuminates the heart" Uthmaan ibn Afaan http://www.khalifahklothing.com
My personal favorite, especially the lengthy section on Women in Islam and Animals. ^^ Very interesting!
And for the young un's, there's Islamic Kids. Has the basics and is also mind-meltingly cute. http://islamickids.tripod.com/
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The Prophet salla Allahu 'alaihi wa sallam said: "The slave shall utter with a word he does not see harmful that will cause him to fall into Hellfire for seventy autumns." Narrated by Thirmidhi.
It's not a website but rather a book...although the title always bothers me.
Idiot's Guide to Understanding Islam
by Yahya Emerick
It's actually good ma sha ALLAH. My mom was given it as a gift after she made shahada. I read some parts of it and actually learned a whole bunch of neat facts of our deen.