Hey Gsouthee. I've seen some impressive results on a few laptops... the best is probably the Macbook Air, which is about to be refreshed. However, any dual-core Sandy Bridge laptop, 14-15" in size, with an 8 or 9-cell battery should be able to hit six hours with moderate usage. Larger 17" laptops and/or Quadcore processors will drop the battery life by several hours under load conditions.
If you really really want nine hours of battery life out of a laptop I'd either suggest carrying around a second 9-cell battery, or actually considering a newly refreshed MacBook Air as that's the only laptop I've seen hit nine hours with web surfing. I am assuming the next-gen model can do the same, something that needs to be proven...