I have low milk supply so I'm always working on ways to increase it, even if it's an ounce or so. Well, I've been practicing hand expression for a few days (watch video below), and have increased supply by almost 2 oz a day!!
http://newborns.stanford.edu/Breastfeeding/HandExpression.html
Here's what I do each pumping session:
1) Pump both breasts at the same time until milk stops coming out
2) Single pump and use hand to massage each breast (usually a bit more comes out
3) Hand express each breast into pump flange, then resume single pumping.
The whole session takes about 35 minutes.
Hopefully this helps someone as much as it helped me!