We all know that normally Yahoo looks for keywords in the title, description and category (with title being the most important), but I've started to see some weird results lately. Take a look at this search for vinyl windows
http://search.yahoo.com/bin/search?p=vinyl+windows The #10 listings, Plastiques Industriels RPG Ltee, has no keywords anywhere and is beating a 271 sites that actually have keywords in these places. Could Yahoo be starting to index the actual pages instead of just title, description and category?