Blacksmith Coffee Roastery
Simple yet excellent Shopify app! If Shopify has one weakness, it's that its blogging platform is very lightweight. As a result, most merchants end up using a standalone blog utility like Wordpress, Blogger, Tumblr, Posterous,etc.
BlogFeeder allows you to blog on your favorite platform and automatically have it post to your Shopify blog. This is valuable because so many Shopify themes display recent blog post titles, but they are derived from your Shopify blog url, not your standalone blog utility.
Unless you can code, you'll end up copying and pasting to keep your "recent posts" up to date with your "real" blog.
Use BlogFeeder and save yourself the headache. Bottom line, its worth $3.99/month
Overyde.com / The Discount Art Supply Co.
Does exactly what it says and is super easy to use.