While browsing the Internet I came across this post that I’d like to share with you. Hope you’ll find it useful:
9 Reasons to Keep A Reading Journal
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To keep a log of what you’ve read
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To keep a log of how much you’ve read
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To record your impressions
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For research
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To write an essay, article, thesis
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To gain an awareness of your reading taste, and the changes in them
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To strengthen your understanding of the reading material
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To better remember what you’ve read
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It makes you a better writer
There is also a second part
How To Keep A Reading Journal
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Selecting A Journal
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The Basics: Always date your entries. Always write the title and author of the book.
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Page Numbers on Quotes
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Write as you read.
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Write your impressions at the end
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Technical aspects
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The book’s impact on you
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Write whenever you want
A Crime is Afoot 
I usually do not write as I read as I find I write too much and then have difficulty editing out what I was thinking about the book.
Thanks for your comment Bill. I don’t usually write as I read as well. But sometimes I feel I should keep a pad and a pen nearby to write some thoughts or quotes. I note your point if you just write too much. And obiously it very much depends on what your are trying to achieve. If you are writing a thesis, for example.