I enjoy making lists on this site but I also appreciate the inspiration it gives me to do more fun things. I read Ready Player One since it made so many list. Same goes for my recent watching of Lake Mungo. These are the resources I most use while tracking down books, movies, restaurants, plays, albums, places to travel, etc. Sure, I also use travel guides, etc but wanted to keep this to 20. I hope people who might not be familiar with some of the sites might use them
Top 3 that might not be familiar with
1) Internet Archive - great for all types of movies, books, radio plays, etc that are not in public domain like "Homunculus Part 4: Die Rache des Homunculus" and found books by Fritz Leiber and Leigh Brackett
2) Comic Book Plus - find all those Golden Age comic books out of the public domain. Full runs of Planet Comics, Sheena, Black Cat as well as many rarities
3) Project Gutenberg - books of all sorts out of public domain
