During a recent client interview, Alex Miser of BSA LifeStructures, told me his secret for generating blog content when struggling with writer's block. He takes a recent company presentation and turns every slide into a blog post. This is a great way to find quality content ideas and it lends itself to easy story telling and interlinking of content.
And you don't have to use only your organization's presentations! Try SlideShare to find presentations and topic ideas from others in your industry.