*In Texas accent* "That stain has weapons of mass destructon and we are calling a preemptiv strike against it. I will not rest until the opressed rug is free from its vomit tormentors."
All Bush impressions aside, I prefer to either soak with water, hang out to dry, and then scrape it off with a stick, or if it attached to the ground, take a large, sharp knife, cut out the area, go to nearest fabric store, get fabric that looks like it and sow it on. If that doesn't work, cut it out, and rearrange the stuff so that a coch or large armchair is over it and no one will notice.