Oh please. The last straw? What are you going to do? Boycott it? It's already been scheduled for a release on Tuesday. If people play the Potato Sack games and get it released earlier than that, how is that a bad thing? You don't have to do a goddamn thing if you don't want. I'm pretty sure the rest of the internet will take care of it and you'll get your precious Portal 2 earlier than expected anyway.
And to be perfectly honest, the cross-promotion is great because it's an awesome way to promote really good games that people might not have known about or had been on the fence about before. Seriously, pick up Rush or The Ball. Both of them are fantastic, and if you're really jonesing for some Portal stuff, definitely get The Ball, because it's got an entire hour-long free DLC map pack that features 7 Aperture Science test chambers with original GladOS dialogue. Rush has extra puzzles with GladOS dialogue and companion cubes too.
There are more games out there than just Portal. How is Valve encouraging you to check out some awesome indie titles a bad thing?
You're just as bad as those awful whiny people who complained about Valve making Left 4 Dead 2. Honestly, the sense of entitlement some people have baffles me.