One other thing that stands out to me about Psych is the CGI used to indicate Shawn's skill of rapidly observing his surroundings. The technique: a closeup of Shawn's face followed by a quick camera zoom-in of whatever he's looking at. The special effects come into play when the surroundings dim and the key on-screen element is highlighted briefly with a white glow. There is also an accompanying audio "hook" to grab the audience's attention, and a sound effect as he absorbs each crucial piece of information. It's well done -- the rapid editing, the effects and the audio all convey Shawn's quick mental abilities and photographic memory.
The camera techniques used to such great effect in Psych reminded me of how badly it was done on UPN's The Sentinel (back in the late 90's). In that show, Jim Ellison was supposed to have heightened senses as well. Whenever Jim spotted some small detail at a crime scene, they used a dramatic (but agonizingly slow) camera zoom-in. Unfortunately, the overall effect was that it made Jim was pretty slow himself. My friend Ronald and I used to joke that Jim's heightened senses compensated for his pathetic police work and barely brought him up to the level of a normal detective.
The Sentinel shows how a good premise can be ruined by bad execution. Psych manages to deftly avoid all the same mistakes; it conveys visually what you expect from Shawn's character, and the result really enhances the storytelling.
* In case you don't know about the What's Hot feature, tune to one of the mix stations (like channel 104's Sports Mix) and wait for a few seconds. A prompt will appear at the bottom of the screen telling you to hit the red button on your remote for the What's Hot list.