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It looks like they're also running a promo where every day, 30 people get the top 5 games on their wishlists. Although the chances of winning that one are infinitesimally low, given that there's 2+ million Steam users out there.
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Now I get why you can't put packs on your wishlist. On the other hand, you can put games on your wishlist that aren't out yet (like deus ex human revolution and portal 2) and aren't available for preorder yet and don't have a price-tag yet, wonder how they're going to handle that..
I've now put napoleon: total war, dragon age: origins, mount and blade: warband, fallout: new vegas and warhammer 40.000: dawn of war II in the top five of my wishlist (putting some of the cheaper games that I might want to buy sometime a bit lower).
EDIT: regarding deus ex, the pack is being advertised but both games separate are also 75% off, personal tip: dump invisible war, nothing but trouble that one. Just stick to the original.