I've seen a couple moms recommend the neti pot.
I have one and have used it, but I've found, what works even better. . . use the lavage bottle (of course, a clean one) that you got when you had your daughter. If you don't have one, you can probably find something similar at a pharmacy or medical supply.
Just add 1/8 teaspoon non-iodized salt to WARM water, and flush. If it's REALLY bad (I had a sinus infection a month ago, an this REALLY helped), hot-pack your face before you do it - as hot as you can stand it. (I just use a washcloth and turn the faucet all the way hot.) I don't know if it shrinks the sinuses, or melts what's up in there, but it allowed the saline (neti-water) to actually travel through my sinuses, when it wouldn't before.
For those unfamiliar with "flushing" (whether with the neti-pot or lavage bottle): look at yourself in the mirror (over the sink), cock your head to the side just a little, and while breathing through your mouth, pour/gently squeeze the water into the "upper" nostril. It'll travel up through your sinuses and come out the other nostril. Just be careful not to tip your head back to far, because the water will run down your throat - yuck!
Happy flushing!
M.
SAHM of a 4-year old and a still-nursing 19-month old
(I'm sure I'll soon be writing for weaning advice)