I have known about MerchantCircle for quite awhile but had never really delved deep into all that they have to offer.
Interestingly, today I was creating a listing on MerchantCircle as part of some local search optimisation for a client and I found that MerchantCircle offers a basic blog and a (seemingly free) basic newsletter system for small businesses. More robust options and a service are available, no doubt for a fee.
This is a great find.