No matter you got a blog or an e-commerce site getting visitors engaged with the site helps increase the loyal visitor count.

You can get the visitors engaged in many different ways. You can run a contest, give away something free, offer a free service and many other things.

I like one of the techniques blogger ShoeMoney does on his blog. He got a "Free Shirt Friday" event every friday. He recieves T-Shirts from different websites/companies and he wear them, take some pictures and post them as a blog entry. As an example I am posting this picture from ShoeMoney blog (hopefully he won't sue me for this)  

Now that ShoeMoney is a reputable blogger and he earns a good amount of money from his blog; why he would spend all these effort taking pictures and making a blog entry? Answer is simple, building customer relations and getting visitors engaged.

Its always good to learn from people who already made the way up.