Pretty cool forensic-related stuff that you can learn from, like finding out who the murderer was by checking out bacteria colonies left in a crime scene - apparently each and every person has different subspecies of bacteria living on them.
The last one I watched was Fringe. I've been trying to clear them off my DVR. They've been piling up. It's a great show if you like Sci-Fi. It's also by JJ Abrams, the guy who created Lost.
I watched Iron Chef at my cousin's house last night.
I don't watch it myself, but I love their attitude, especially the main guy when he eats that capsicum like it's the best thing ever. Also, the commentators are always so excited xD
(The show officially "finished", but they're re-doing the episodes apparently.)