For the past few weeks, I have run into a problem with links to Apple.com coming up 404 "not found." Specifically, these have all been links to pages on http://support.apple.com/. For example, this morning I did a Google search for 10.7.3 combo. One of the first results was a link to http://support.apple.com/kb/DL1484 which came up 404.
Here's where it gets interesting: the link is only 404 in Safari. It works in Google Chrome and Firefox. If you reload the page in Safari (⌘ + R), it will load as usual. As if that wasn't strange enough, once it has loaded correctly, subsequent visits to pages at http://support.apple.com/ work fine... for a while. Then I will see the "We're sorry" page again.
Several TUAW staff members have been seeing this bug for a few weeks with Safari in 10.7.2; unfortunately, it is not fixed with 10.7.3. Fortunately the "workaround" is fairly simple: if you get a 404 page on support.apple.com, try reloading the page, or just use a different browser. You'll need to do so if you're downloading the combo update to fix install issues with 10.7.3.