OMG I am always getting writer's block! I find that if I am sleep deprived or stressed (from running after 2 small children maybe?!) I find it really hard to focus on what I want to write. I have found a couple of strategies for overcoming this:
Take a break. Switch the computer off and have a cuppa or a play with the kids or read a book or just do something different.
Open ALL my current articles that I'm working on and just read through until something triggers inside me.
Whinge about writer's block. Every single time I complain about having writer's block the block is lifted within minutes! True!
I presently have approximately 10 articles sitting in my "pending" folder that are all in varying stages of completion - a few are nothing more than a title. But I know that they will get written in their own time.