I don't report on startups. I interviews founders after they built their companies to find out what worked and what didn't.
Even if you were the same as Mixergy it wouldn't matter. There's plenty of room on the Internet!
Just so everyone's clear, AndrewWarner is the man behind Mixergy. He's saying Mixergy interviews successful founders, whereas The Startup Foundry is more of a general startup info site. (I agree there's quite a bit of overlap, though, and I also agree there's nothing wrong with that.)