I've said it before, but: What's the deal with 404 pages?
If the content has moved, I should get a 30x redirect. If the server has a way of guessing what I wanted, I should get 300 Multiple Choices. If the server knows that what I'm looking for isn't anywhere, I should get 410 Gone. 404 is supposed to mean that the server has no idea what I'm looking for, no idea how to find it, no idea where to look.
In that case, I don't want a page to load. I don't want a tab to open. I definitely don't want to download a Flash game, or a 500kb JPEG, or infinity many Lemming images. I just want my browser to mark that link as dead and let me know in as unobtrusive a way as possible, "Hey, you clicked on some bullshit!" Let me either search the domain or click something else.
Not to rag on creative 404s, and I know it's a bit of a pipe dream. Just a peeve of mine.