Welcome aboard. :-) They say 'Forewarned' is forearmed', so:
'Watch Lists' are really good. They help you keep track of what you have watched and what you plan to watch. Problem is, every time I come here to tick one off my 'Watched' list, I find three or four new ones I want to watch. I think I currently have about six years worth of watching to do. Of course, it has helped me find some really excellent stuff I probably wouldn't have got to know about otherwise so, overall, it's a good thing. :-)
