If you have a link behind a site that requires authentication (gmail, rt, etc), and you option-click it to download the target of that link, instead what gets downloaded is the source of the login page for that service, instead of the resource that the link points to. The easiest way to reproduce this is to email an image or PDF or whatnot to a gmail account, then try to download it. This issue seems to only appear in Leopard, but is reproducible in Safari 3, the latest nightly (r30191), and OmniWeb 5.7.