I agree with Lisa - better to post the recipes in the relevant 'Atkins food and recipes' Forum - so desserts in the dessert forum, main dishes in the main dishes forum and so on so future members can find them more easily.
You can always post here with a link to the recipes you post there to alert members. Make each recipe shows the title of the book and the author & publisher, so interested members can order the book if they feel it would be useful to them
Just a thought though - if you intend to post more than a few of them it might be good to contact the author/publisher to make sure they don't mind you doing so and will not object to you 'publishing' them here. Infringement of copyright cases can be expensive