(Linking helps somewhat, yes, it's a good suggestion. If so - state in the torrent descriptions that only torrents linked to from bitcoin.org should be implicitly trusted)
I thought this whole thread point was to have a way to diffuse the client in the event that the main website is taken down?
Anyway, the main executable is stored on sourceforge, and the dev version on github. They are not likely to suffer from large influx of new users.
Also, going through the sourceforge filter allows to estimate the number of download more accurately.