Content is really important because without it your site is just pictures and affiliate links. I cant give you a list of great topics to write on but i would encourage you to read last weeks blog post at PAP on content.
Content is King? There more important things to think about.
Hope this helps you man, when I am stuck I always like to read blog like mine and see what other people are talking about. More importantly find out what topics are getting the most comments and take a spin off that!