No, not my list, but blogger Stephen Bowie has compiled his top fifty (leaving room for another fifty as viewing permits) and it's impressive. Of course all of this is wildly subjective, but what I really like about Steven's list is that it picks and chooses from the entire history of television, 50's to the 2000's. So there are episodes of '60's "The Defenders", Richard Boone's "Medic", as well as (ahem) the 2000's version of "Battlestar Galactica" and "Sopranos." And all years in between, including dramas and sitcoms. Much to argue about and discuss, but also it's a cool roadmap to finding some interesting TV that's fallen off the grid.
The rest of Stephen's blog is equally fascinating, with profiles on character actors and lengthy investigative pieces on TV producers/writers/etc from the past. Thanks to Mark Evanier for pointing me at this site!