When you're operating a blog for profit, not writing isn't really an option.
Sometimes I get some really killer cases of writer's block, and I usually end up posting something uninspired and yawn-worthy when they hit. I've heard a lot of different advice, but usually I just end up browsing the web 'till something hits me, and then rushing to get the post written up. I wish I had a better system, but the whole process is just torturous if I can't find anything I'm interested in to write about.