Tutorial:
Flash prototyping:
http://www.johnniemanzari.com/flashlabs/

Book:
Flash MX for Interactive Simulation:
http://www.amazon.com/Flash-MX-Interactive-Simulation-Macromedia/dp/1401812910

PDF Documents:
Building a Usability Prototype in Visual Basic, Flash, and Dreamweaver:
http://www.dgp.toronto.edu/~dwigdor/teaching/318/prototypes/document.pdf

Information Ergonomics Lectures for Creative Prototyping:
http://www.idc.ul.ie/hcieducators06/Procs/woolley.pdf

High-Fidelity Prototyping and Flash Overview Prototyping Revisited:
http://www.sm.luth.se/csee/courses/smd/157/slides/HighFidelity.pdf

Examples:
http://nigelwhitbread.blogspot.com/2006/11/user-centre-design-notes2.html

http://karenau.net/portfolio.html

http://www.productinterfaces.com/projects.html

http://myurc.org/tools/FlashUrc.php

http://webzone.k3.mah.se/projects/Flash_Prototypin/Folder/index.aspx?page=3&tab=9&id=1

Other:
Use scrollwheel in Flash:
http://www.hotscripts.com/Detailed/37552.html

OpenLaszlo for UI Prototyping:
http://lists.whatwg.org/pipermail/discuss-interactiondesigners.com/2005-September/007194.html

FLASH Lab prototype boards:
http://www.mecanique.co.uk/products/flash-lab/flash-board-main.html

Adobe Thermo:
http://labs.adobe.com/wiki/index.php/Thermo

Use XBox 360 Controller with Flash:
http://flashjoystick.pillowfortgames.com/

GAIA Flash Framework:
http://www.gaiaflashframework.com/

Using switch/case in Flash:
http://www.kirupa.com/developer/actionscript/switchcase.htm