There is a "Beer Garden" down on the main strip along the Falls - If you walk it to see the falls there is a "Beer Garden" on the right hand side. I don't remember what they serve.
The other one I know of is 'Sports Bar' (I think thats the name) on Clifton Hill across from the Ranforest Cafe. I don't recall them carrying any diverse beers, but they have video games, pool table, darts, etc and plenty of TVs. They serve big beers...
Drinking: Brown Ale, Belgian, Apple Ale
Planning: Scotch Ale, Stout