While checking my RSS feeds this morning, I found this post from Daily Writing Tips:
I have subscribed to their feed for a long time now, and I find a lot of useful information. This latest ebook should be useful to everyone, not just writers, who wish to be grammatically correct, whether it be in their professional or personal writings, including email.
To download the ebook all that is required is subscribing to Daily Writing Tips. Links are provided in the post to subscribe, and you can unsubscribe at any time, but I think you will find plenty to keep you from unsubscribing.
You can also follow Daily Writing Tips on Twitter as I do: http://www.twitter.com/writing_tips.