Flex 2.0 comes with a great set of essential components for building RIA’s, but if you have the craving for more top quality components, check out flexlib. It is an excellent open-source component library at Google Code, that contains quite a few components that could be useful in your next Flex RIA.  As you build more and more Rich Internet Applications you might find, like I admittedly did, that having access to more components could in essence expand your palate and consequently the range of things you can do with Flex. This is a terrific, comprehensive repository they have over on Google code so if you are a Flex developer you  have to take a look at.
Javascript Carousel Widget
iCarousel is an open source JavaScript tool for creating carousel like widgets. Based on the MooTools JS library, iCarousel is a nice widget with lots of possibility for customization.  We are starting to see a lot of these interesting widgets for various types of functionality that are geared towards applications like photography and e-commerce and plenty of others. It’s indicative of the versatility and power of JavaScript that these additional tools are created to extend the language into all sorts of interesting areas. Widgets are coming into their own as small applications created for very specific tasks,  and we are seeing that even non-technical users find them to be very easy to use.