How you can help!

Try it, and give feedback to the mailing list!

Try out development versions from the Sourceforge CVS.
Add memory logical row / physical slot label mappings for your motherboard to the wiki.
Add black-list entries for broken PCI devices to the wiki.
Hack user-space stuff.
Expand the wiki.
Find the data sheet, and write an EDAC main memory driver for your chipset - I was surprised by how easy this actually was!