I bought the Wolfmother album off iTunes as someone told me they were reminiscent of Overtoad - the first band I was in. More than one review mentions Black Sabbath and Deep Purple, and while I think they do have that vibe about them, they more strongly resemble bands like Grand Funk (c.1969) and Blue Cheer, and are not too dissimilar to the White Stripes, or even Supergrass. Though I agree with Pete about it wearing off quite quickly, I do like it, and it's perfect to hide amongst the iTunes playlist to pop up randomly every now and then. It's good stuff (with variable lyrics).
They come complete with a Frank Frazetta cover (what could be more apt?) and it's nice to hear that the E-minor pentatonic scale is in pretty good hands and still doing what it does best.