When I select one or two words with the toolbar and do a related search, the results look very similar to a regular keyword search. Am I doing something wrong?
Try selecting more words (e.g.: a sentence, a small paragraph), and then typing in a short query (or no query at all). Because Y!Q looks for the context of your search, the more information you provide, the more likely you are to get more results related to your search. When you select only one or two words, the context may be too limited and thus provide results that are very similar to regular search results.