After using AS2 for several years, I\'m getting started with writing applications in AS3 (Flash9/Flash10). I\'ve come to the point where I need some full sets of GUI compone
If you are making a GUI application, this is exactly what Flex is for. As well as the built-in types you get a visual editor which is very nice, cool binding functionality, and other stuff like built-in drag & drop.
Try out AS DataProvider Controls
Go with the Cs3 ones - created by Grant Skinner I think.
Flex framework has a nice, consistent API that I wouldn't consider "bloated" - yes, it's a feature-packed UI framework but basic things like buttons and layout panels don't require any deep knowledge. And XML-based language for UIs is a blessing (all modern UI platforms do that, be it DHTML, Flex or WPF/Silverlight).
MyLib is another nice component library for AS
Yahoo's Astra components aren't bad either: http://developer.yahoo.com/flash/astra-flash/