Nah screw Flash - learn SVG instead - it can do everything that Flash can do, but it's markup based with a completely open DOM. You don't need proprietary software to make it, you don't need to learn a proprietary scripting language to add interactivity, and it's properly accessible because it's real markup, not binary data.
"Why bother with accessibility? ... Because deep down you know that the web is attractive to people who aren't exactly like you." - Joe Clark