As it's typical that a new topic is posted that was was discussed or beat to death in the past, it's very helpful to use the search feature and find comments that might be useful in discussing the new topic.
Unfortunately, it doesn't appear to work and here's an example where I searched for the word florida with yours truly as the author and nothing came up. Of course Google can be used (and does show numerous comment hits for florida and me as the author) but Google only catches maybe half the articles here.
http://files.me.com/markbyrn/51bmucOf course it's quite possible that I'm doing something wrong and I've tried changing the match criteria and capitalization but still nothing comes up. This is just one example by the way and I'm guessing that regardless of what you select (Titles, Description, Tags, Comments), it only searches titles or descriptions and not comments. Perhaps somebody has the magic key?