Flash is one of those programs that people tend to get passionate about, so it's not surprising that there are hundreds of great resources on the web offering everything from example code to free components, articles, tutorials, and more.
Here are a few that are definitely worth checking out:
Flashthusiast(http://flashthusiast.com). A blog maintained by Team Tween of Flash at Adobe. You can read the new developments or search the archives.
Flash Kit (www.flashkit.com). Surprisingly badly designed for a site that focuses on a design program, Flash Kit nevertheless offers a wealth of sound effects, fonts, components, and movie clips. It also hosts a well-attended online forum.
ActionScript.org(www.actionscript.org). If you're interested in all things ActionScript, this site offers tutorials, articles, and forums populated by ActionScript programmers. Once you've earned your stripes, there are even job listings where you can put your new-found skills to work.
FlashTuts+ (http://active.tutsplus.com). Tutorials on ActionScript, AIR, Flash, and other design tools.
Flashloaded (www.flashloaded.com). A place to purchase predesigned Flash components. You'll find photo and media galleries, menu and navigation tools, and animated effects like book-style page flippers.
Keyframer (www.keyframer.com). Chris Georgenes's website and blog is fun and has good info, especially for those interested in character animation.
Best Flash Animation Site (www.bestflashanimationsite.com) and Webby Awards (www.webbyawards.com). There's nothing like watching a beautifully constructed Flash animation to get you thinking about good design. On these two sites, you can nominate the coolest Flash animation you've ever seen (including your own) or simply visit the sites others have nominated.
Boston Adobe Mobile and Devices User Group(www.flashmobilegroup.org). If you're interested in creating Flash content for mobile devices (like mobile phones), you'll want to check out this site, which offers Flash Lite–specific articles, seminars, links, and live chats.