Square Fireballs.
Sadly, he isn't posting anymore. I think it's a good place to start, though if you rove the blogosphere long enough you'll find plenty of fixes. If only one hub could collect them all and create some sort of massive, comprehensive wiki or something.
And yes, we all have enough material to create stuff for decades, but I want moar. Seriously, looking everywhere and seeing new adventures for other rules systems makes me long for that kind of support for my edition of choice. But where are the would-be designers who'd consider supporting 4e into the future, given the hard truth Abdul laid on us above? I think it has to come from the fans. Organized, competent, and dedicated fans. Or fans enough to hold other, flaky fans *cough* accountable. Maybe out of love, maybe to get noticed by the larger (relative) rpg world, whatever, but I'm wondering who else is there?
No company is going to rely on 4e, and yet there are 4e fans out there shuffling like nomads, migrating to other systems or just sort of sticking it out with what they have. These fans deserve support. Hoping Sasquatch Games becomes one such supporter, and maybe Kobold takes pity in our growing obscurity to provided smatterings of support, but it's just not enough. Gotta get this enterprise off the ground, and soon, before we all kind of blow away like dust.
At least we still have some 4e material out of Encounters and Dungeon. Fleeting, no doubt, but there on a monthly basis.