I’ve written a helper class for loading and monitoring resources which is based upon an AS3 library called Queueloader located at Google Code. My version is written in AS2 and has the following features:

Individual monitoring
Overall queue monitoring
Image loading
SWF loading
MP3 loading

http://fboyle.com/blog/?p=17

http://blog.hydrotik.com/category/queueloader/

Provides an easy way to invisibly preload SWFs, FLVs, or images and optionally trigger a callback function when preloading has finished. It also provides _width and _height information for all successfully preloaded SWFs or images, and duration information for FLVs (assuming they were encoded properly and have MetaData).

http://blog.greensock.com/?p=7

LoadingQueue is a simple loading proxy function that controls queuing of loading actions, so you can better control what gets loaded, when, in what order, without being forced to call a bunch of loads and pray that they don’t timeout in case there are too many files to load.

http://labs.zeh.com.br/blog/?page_id=97#loadingqueue

ImageLoader is a straightforward image loader. It simplifies the job of loading images by automatically creating a list of images being loaded, controlling its queue with priority features (by way of the LoadingQueue class), and by caching images locally using BitmapData instances. This means that when you try to load a new image, it actually loads the image, saves its BitmapData, and attaches the image to the container (with smooth turned on). Additional image loadings will simply be skipped and the cached bitmap is used instead. Simultaneous downloads also “understand” each other so if you’re loading the same image on two different containers at the same time, they will have the correct loading percent set and events fired.

http://labs.zeh.com.br/blog/?page_id=97#imageloader

The Load Queue Manager Class is a development based on other prior developments for managing the loading of multiple external assets into a base movie.

Assets are registered with the Load Queue Manager Class which will progress through the existing queue until all registered assets are loaded.

http://blog.bittube.com/downloads/