I've just been to your blog, and I love it. What a fantastic idea. Now you
have me thinking about what secret I can put on a postcard for you.

It reminds me of a restaurant in Manchester (UK) where customers are
encouraged to leave feedback, comments and random things written or drawn on
napkins, and these are then pinned to the walls.

As for help with promotion, my first step would be to sign up for a blog
tracker such as www.technorati.com and www.blogsearchengine.com

And it seems that ...
http://www.petercooper.co.uk/archives/000571.html
http://www.petercooper.co.uk/archives/000571.html

...people are talking about it already. :)

Sarah