Really it comes down to this (in my opinion): There's the easy way, and there's the efficient way.
The easy way is to wait till inspiration hits you; however this could be days, weeks, or even months. And I can almost guarantee you that during all this time you'll feel guilty about not writing. So although it's the "easy" way, it really isn't a good way (but hey, who ever said that writing was easy?)
Now, for the efficient way; sit down at the computer (or a typewriter, or with a pen and paper, whatever) and start grinding something out. It probably won't be your best work, but it'll get you started towards getting to interesting and exciting stuff again, and afterwards you can always go back and polish that section up, or re-write it. When you're forced to grind it out, I often find it best to have a daily quota, it doesn't have to be a big one, but there should be a goal you want to reach for. Importantly, this has to be a realistic quota; although you might be able to grind out three thousand words on a good day, will you be able to do that everyday? So instead something along the lines of 500 to 1000 (I don't know how fast you write, so this is really up to you.)
I will admit that the efficient way is not a fun way, but it does get things done, and afterwards you'll feel relieved to be past that part and on to new things.
A good link to other ideas on the subject:
http://www.sfwa.org/writing/strategies.html