Dexter
Combat Hospital (quickly becoming my current favourite)
Game of Thrones
Bones
Murdoch Mysteries
Robin Hood (BBC TV series)
Criminal Minds
Prison Break
Buffy the Vampire Slayer (I still miss that show...)
Angel
Edit: If we're counting kids shows: Teenage Mutant Ninja Turtles and Spiderman. No kids show will ever be as good as those were.
Oh! And how can I forget my old favourites: Xena: Warrior Princess and Hercules: The Legendary Journeys.
Also...old X-Files before they went all crazy. I remember when it came out, it was all the rage in 3rd grade
Also, good memories watching Murder She Wrote with my mum when I was very young.