I'm pretty skeptical of things I get online having some bias and/or not being entirely accurate. Some of the things I read came off as a bit of a sales pitch, so I think it is important to keep the source in mind reading them.
The first overview I'm linking to actually is trying to sell a book, A Brief Illustrated Guide To Understanding Islam. I linked to chapter that gives general information on Islam. I was impressed that this site backed up information with citations.
This first one is from a Christian website.
This is a Top 10 Myths About Islam list from About.com, which to my knowledge has no religious affiliation. If you click on the author's name you'll see that, "Huda is a Muslim educator and writer with nearly two decades of experience researching and writing about Islam on the Internet. An American woman of Irish/English descent, she has been a Muslim for the past 20 years."
Here's one more view, from a British Islam group.