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One of the most asked questions in twin websites or forums on the internet is what are the chances of having twins.
The following are the best 5 sites that, in my opinion, try to answer that question.

1. Twinstuff

This website has very complete information, including charts from the USA National Vital Statistics Reports.
Although there is no way to determine if it is sure that you will have twins, with the help of this charts you can have a decent estimate. 

2. Multiples.com

I like this site,  because not only gives statistical information,  it also tells how to increase or decrease the chances of having twins.

3. RaisingTwins.com

Unlike the first two,  this gives all the information in a more informal way, but it is very interesting,  talking about some ways to increase the chance of having twins .   And it talks about more things than the previous ones, for example, places in the world where twins are more common, like Nigeria, and the reasons for that.

4. BellaOnline.com It’s rather short and concise information, but covering a lot of points.
    
5. GoAskAlice.com

This answers a very specific question,  about the probability of having twins skiping a generation.  I had heard about that long time before my wife got pregnant with twins,  but in our case it was her mother who was pregnant with twins (and lost them).  What I had never heard was the importance of how many males or females are in certain generation,  and maybe that is the reason I consider this one of the best 5 websites that discuss about the chances of having twins.

Did you like this list ?   If you have another website to recommend,  please do it in a comment.

Very interesting video showing how you see twin on ultrasound.
Very useful for new parents of twins, to see what to expect in the ultrasound.