Intel had a number of Nehalem systems up and running at IDF. Clock speeds are unknown but there are tons of threads being spawned. The desktop platforms feature X58 motherboards with 6 DDR3 DIMM slots for Nehalem's 3 channels. Also on display was a Nehalem server with 144GB of DDR3 memory thanks to MetaRAM's 8GB DDR3 memory modules.
Gallery: Intel Nehalem Demo Systems