What are all the reasons to Google to suspned our account?

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Today when I tried log in into my gmail account, I was unable to do and I got the message as my account is suspended to due violation of terms.I shocked a lot on seeing that as all my online activity is related with my gmail account only. I am having blogger.com blog this has also been removed and I came to know about this through my on line friend, But after few minutes,every thing is OK and now I am able to enter into my gmail account and I am able to access my blog. But I am not sure,my blog is visible to others or not. I had a affiliate product related to increase the Google adsense earnings in my blog but I don't have google adsense ads in my blog. WIth the doubt of the product , I removed from my blog.If you have such experience with google please let me know,that for what are all the reasons they will delete or suspend our account?Please let me know my blog is visible to you and the link for my blog is in my profile banner.This is not to get visitor to my blog and just wanted to know that it is visible to others or not and you may not go inside my blog if you feel so..Also tell me some other site which offers free hosting of our blog like google.