Ben Long's review got the major features right, but has a few errors.

He says "The Layers palette no longer includes icons for linking layers". Not true. Multiple selected layers can still be linked by clicking on the new link icon at the bottom of the Layers palette, and linked layers are identified by a new link symbol at the far right side of each layer in the Layers palette.

Next, he states that "to constrain an adjustment layer to a particular set of layers, you now group the layers with the relevant Adjustment Layer and then change the group's blending mode from Pass Through to Normal". If you only want to constrain the Adjustment Layer to a single image layer below it, you can just Option/Alt click on the dividing line between the two layers. The old Cmd/Cntrl-G shortcut now creates a Group (formerly called Layer Set) and if you go that route then you must follow Ben's procedure for changing the blending mode.

He also states "Locking has also changed, and layers no longer sport a Lock icon. Instead, you lock a layer by selecting it and then toggling the lock controls at the top of the Layers palette. Adobe has greatly improved the locking facility, which now lets you lock content and positioning separately." Not true by a long shot. All the functionality he mentions was present in Photoshop CS, including separate locking of content and positioning. CS2 does nothing to change layer locking.