I've just put a permanent link about this on my sidebar, but I wanted to add an entry as well. The HER Foundation (HyperEmesis Research) and USC (University of Southern California) are teaming up to do an HG research project to study the links between genetics and HG. If you have ever had HG, you can do future HG-mums a big favor by participating! It is super-simple. Just follow the links to get in touch with the researchers and learn more about the study. This is not effort-intensive and is very user-friendly. Please try to get involved!!
The researchers are also looking for mothers who have not had HG to serve as controls. So regardless of whether or not you've had HG, if you've had a baby you're eligible to help with this study!