we talking like a DIY section for each manufacturer or a DIY section having to do with general stuff like around the garage/house/whatever

each car section should already have that sort of DIY stuff in it. I think good write ups and what not need to be encouraged and sticked. In the Nissan section, the general answer is "Search" and you end up on some other forum to get the info. We have started a "How to test..." sticky and it has gone over really well.
But I don't think there needs to be a whole section to it.
I do think a section for around the garage/house would be nifty as hell. Stuff like Puto's date rape how to would be awesome and how to get oil stains out of driveway stuff would be great too.