The Temas Blog discusses "Musings about the Evolution of Consumer, Environmental & Health Policy in Latin America & the Caribbean." Much of the content is in English but there is some Spanish also.
BlogBlogs is a blog directory/network in Spanish. It offers a tracking widget you can put on your blog, which is how I found it.
DIHITT looks like a networking/news service, also in Spanish. It includes a friends tracker widget for blogs, which is how I found it.