I’m sure I’ve mentioned this before, but come on, designers and developers, you do know that it’s very poor form–and it’s likely to be very abandoned form/promotion/application when your site relies on pop-up browser windows that the browsers themselves block.
I mention it again because the news flash hasn’t made its way around the Internet yet. In the last couple of days, I’ve found a couple of sites using Flash that try to open a new window from within the Flash, and in both cases Firefox and Internet Explorer 7 say nuh-uh, girlfriend.
The first is the home page for Graco Baby Products. The first time you visit it, and only the first time you visit it apparently, it displays a sweepstakes program of some sort:

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If you click that Enter Now button, you’re done. The pop-up is blocked and the page won’t display the link again the next time you reload the page. Which makes the odds better for the people who actually get to it, I guess.
Sorry, I don’t have a screenshot of the pop-up blocker notification since I can’t get the Flash overlay again. Also, I can’t get the swell JavaScript error that displays if you let the overlay automatically close via a timeout. But the point remains: if you’re going to use a plugin to elicit a pop-up window, you’d better make sure it works in spite of the browsers’ native pop-up blockers.
The Best Buy Hang with Hancock Better Summer Sweepstakes does the same thing. Here’s the page with the Flash-based Enter Today link:

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Click that link, and:

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Denied.
I told you guys once, I told you a thousand times about that pop-up blocker. Watch your AJAX, watch your plugins, and freaking test the thing before you send it to QA or put it live. But QA is a tell you once, tell you a thousand times sort of job.