I'm convinced to use my white oak slabs for brewing at this point. I'm not so sure about the red oak or other woods. White oak seems like a safe choice regardless of how I use it.
I'm curious about other woods. I know there is a lot involved with this that may include more than esters and flavor contributions. Perhaps some woods have toxic properties? I don't want any of that. I have pretty much any American native wood available to me. Not from the lumber yard, but from the woods themselves. This includes unusual things like sassafras, iron wood, and even other rare woods unique from the Red River Gorge area.
While I have done some meat smoking with unusual woods, I'm pretty sure they will not translate the same when it comes to home brewing. Heck, I've considered smoking malts over coal. Coal has a very unique aroma that might translate nicely in some beers. I haven't done it yet because just about every by-product of coal smoke causes cancer. I don't want to make cancer in a bottle. But the woods seem to be more likely candidates for flavor contributors.