What are the methods for infering genetic interactions?
BioGRID is an interaction database, and they catalogue interactions by (among other things) the class of experiment that discovered them. See http://wiki.thebiogrid.org/doku.php/experimental_systems#genetic_interactions

Other than that, you should look at recent reviews and publications, but you will easily get lost unless you figure out some important particulars, like:


What species? Yeast, worm, human, cell line?
What sort of interaction? Synthetic lethality? Complicated, fancy epistasis?
How much? Genome-wide? 2-3 genes?