I've been using the flashblock Firefox extension for a long time. There's nothing more annoying (to me) than going to a Web site littered with a bunch of flash movies which slow the page load, distract me from the important content, or crash my browser. The flashblock extension replaces each flash movie with a link you can click to enable that flash movie, allowing you to enable only the individual movies you want to view.
But this week I took another look at noscript and discovered that noscript can disable flash in the same way that flashblock does. Looks like the developer(s) added that feature in version 1.1.0 (August 2005). Guess it's been that long since I'd tried noscript (or else I didn't look at the feature list very well). Anyway, I've switched to noscript.