Appropriate resolution for images in flash sites?

I was wondering, seeing that images lose a lot of quality once applied to flash sites, is there a specific resolution that people usually use for their images destined to flash? Someone mentioned there's no point on working with images with a larger res than 45dpi (what? so low?).... and someone else said 72dpi is good enough. Any higher would be pointless, because it wouldn't help improve quality, and only causes very slow downloading of the site.

Is any of the above accurate? If not, then what's your advice?

Here's what you do.

Scan an image at 300 DPI.
Save copies of that image at 45, 72, & 96 DPI with Fireworks (assuming you have Studio MX[2004]/8 ) , Photoshop, or whatever you have.

If you use Fireworks, you'll be setting the DPI when you create a new document.
Then export all three resolutions with the same export settings.

Once you have thoose three images, create 3 new flash documents & do not change any of the default publish settings.

Export 3 SWF/HTML files using the three images.

Make note of your computers current DPI, if you use Windows then right-click your desktop, select properties, click settings tab, click advanced button, click genneral tab, look for DPI dropdown.

View all three Flash movies in Internet Explorer, Opera, Firefox, & a Flash projector.
Make note of how they look & if there's any difference in appearance.

Now, where you found your computers current DPI, go back to that & change it to one of the values associated with the three Flash Movies then reboot the computer.

View all three Flash movies in Internet Explorer, Opera, Firefox, & a Flash projector.
Make note of how they look & if there's any difference in appearance.

Repeat changing of DPI, reboot, viewing.

Do this on a top of the line system, a halfway decent system, & a budget system.

If you send me a budget system, I'll be happy to do thoose tests for you.