there are two parts to flash, "designer" and "developer"
designers are people who draws graphic, edit pictures, do animation, etc, they are those people who make pure flash "movies" like the ones posted in the thread
developers are coders, they make script that run in movies to create interactivity. They are the ones that program flash games, etc
usually people are a mix between the two, i personally is more of a developer than a designer. When people think of wanting to make a flash movie, they would usually think to become a designer, never (usually) think of being a developer
anyway here's two of my works:
http://www.geocities.com/gnownoskcid/bomberman.html (my flash bomberman game)
http://www3.telus.net/gnownoskcid/networking/ (my networking school club site [never even published])
neither are really done, but im too lazy to continue