One thing I like to do to find fresh content to write about is the following.
Set some google alerts for topics in your own industry as well as vertical industries. When you get the alerts you will be able to sift through them and find new stories, products, happening etc.
This can give you things to talk about as well as gives you more insight into what is going on in your industry. There have been many times where I have also discovered other things I should be doing in my business this way.