There are numerous excellent “blogging tips” sites such as Daily blog Tips and Blog well. If you are a beginner there are sites like Blogging Basics 101. Also don’t over look the blog tips that the blog monetizing sites such as Problogger and Performancing.com as these often offer great advice on promoting and developing your blog which you can apply even if you do not want monetize it. There are also blogs about blogging such as Copyblogger, and Lorelle on WordPress and others such as Chris Brogan on using social media.
Blogs for artists, designers and crafters offer tips on selling your art online, such as Art Biz Blog or Art Print Issues and there is is Original Impulse too. For more general information take a look at the new FreshBlogTips