Every writer has days when the muse acts like a sloth, refusing to provide anything worthwhile. It might be good therapy to amuse your muse when that happens. Hop on over to The Ultimate Internet Writers Resource Directory and browse.
Scroll or skim or whatever ~ without anything in mind. Let your muse be amused by topics whizzing by, until it wakes up and with a jolt and stops your mouse on something it thinks you need to explore.
The topic probably will have nothing to do with your immediate needs, but whatever you learn before getting back to the work in progress [WIP] you intended to work on, it's sure to be something your muse knows will benefit you in someway.
A refreshed and happy muse is your best friend.