Theres not much left to know,
1st floor, holds the Student IT and IT training place, has toilets and bubblers.
(it also holds the mclachlan section but as i recall, the entry is left from the big doors down a flight of stairs)
2nd floor, is the one you come in off, reference is on the left, so are casual research computers, to the right are the study areas. Directly in front is the help desk, and the reserve section.
3rd floor holds books and photocopying (cant remember exactly which letters but i spend most of my time on 3rd)
4th holds the law and other stuff, this i rarely go up to, but i hear its a great 'hideout' for a lil sum'in sum'in