Well, my advice would kind of be the opposite: don't expect a TV appearance to send your traffic skyrocketing. TV is just not a traffic generator. One major reason: they probably won't give out your URL. Even if you get them to agree to drop the URL in, they will probably forget, or not have time, or they'll get it wrong. Even if they do, it's not going to get you much type-in traffic.
Unless you're going on something like Colbert, just don't expect a boost. And even if you do go on Colbert, most of your traffic will still probably come from /r/colbert.
Very true so far for us. Our iPad game got a really nice review on the Canadian show 'Reviews on the Run', and that day I think we had only a handful of Canadian downloads (and American). Nothing out of the norm heh.
Unless you're going on something like Colbert, just don't expect a boost. And even if you do go on Colbert, most of your traffic will still probably come from /r/colbert.