I went to the New Albanian Brewing Company's new Bank Street Brewery, which isn't a brewery yet, and had Oaktimus, which is their Hoptimus IPA aged with oak. I think it's cheap, and I think it was aged a long time.
It was interesting. I think they use plain unused uncharred oak, so it's not at all like beer aged in whiskey barrels. It has a good bit of astringency from the wood to go with the same from the hops.