Many drag-and-drop components for Flash are made to help make our lives easier. These are categorized components that are available to quickly get your project up and working with quick, reusable parts.

UI Components:
FlashComponents.net: http://www.flashcomponents.net/components/user_interface_flash_components.html
FlashStore: http://www.flashstore.com/Flash-Components/User-Interface/
FlashLoaded Bit Component Set: http://www.flashloaded.com/flashcomponents/bitcomponentset/
JumpEye: http://www.jumpeyecomponents.com/Flash-Components/User-Interface/
FlexCubed: http://www.flexcubed.com/component_details.php?id=3809f9dde851f2d8ca3d6e95416f3641
FlashExtensions: http://www.flash-extensions.net/
Snippets: http://www.noscope.com/journal/2004/10/snippets
FMXIS: http://www.flashsim.com/FMXISComponents/

Knobs:
http://www.concretecms.com/products/flash-knob-component
http://www.reflektions.com/miniml/template_permalink.asp?id=114

Potentiometers:
http://www.samuelwan.com/information/archives/000056.html
http://livedocs.adobe.com/flash/9.0/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00002485.html

Joysticks:
http://www.flashsim.com/FISComponents/joystick.html
http://www.adobe.com/devnet/flash/sample_files/html/movement_joystick.html

Gauges:
http://www.gotoandlearnforum.com/viewtopic.php?f=12&t=1364
http://www.topshareware.com/KineticaRT-.NET-Gauge-Component-download-14443.htm
http://www.reynaldocolumna.com/blog/archives/gauge-component
http://www.betterthanflex.com/?cat=3

Timers:
http://www.kirupa.com/developer/mx/countdown.htm
http://www.download3k.com/Web-Authoring/Flash-Utilities/Download-CountDown-Timer-in-Flash.html
http://grumpee.instantspot.com/blog/2007/03/28/A-count-down-timer-component
http://www.kineticz.net/components/timer/
http://www.flashloaded.com/freebies/flashtimertrial/
http://www.usflashmap.com/component/countdown_timer.htm
http://www.flashden.net/item/game-countdown-timer-component/980
http://www.bestsoftware4download.com/software/t-free-countdown-timer-in-flash-download-xkvbgygj.html

Sliders:
http://ohmyflash.com/
http://www.flashkit.com/movies/Interfaces/Widgets/Interfac-The_Nagu-10214/index.php
http://play.ground.gr/?p=89
http://ghostwire.com/go/176
http://www.flashextension.net/product.php?productid=16154&cat=4&page=1
http://www.agavegroup.com/?p=28

Uploader:
http://www.reynaldocolumna.com/blog/archives/uploader-component-v21

These are the standard components that come with Flash (as of CS3):

drag and drop keystroke logging component
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