Cas9-triggered homologous recombination is a fast and inexpensive way to make essentially any desired change to the genome of C. elegans.   

We described this technique in detail in a publication (Dickinson et al. Nature Methods 2013).  We have created this web site as a genome engineering resource for the C. elegans research community. We'll keep it up to date with new protocols, reagent information and answers to questions. 
Best of luck with your experiments!

-Dan Dickinson and Bob Goldstein

New on 12/13/2013:  We've added a new "Construct Designs" page with ideas to help you design your homologous repair templates.