Just in case you were silly enough to deploy a fullscreen Flash/Flex app to the web, browse to it on a Flash enabled mobile device or tablet, and expect it to look nice:
To be fair, it’s not a Flash/Flex issue at all, but rather a mobile browser detail worth knowing about:
Essentially, mobile browsers assume a default viewport width of 980px at 72dpi for any given web page and scale the content according to the actual device DPI.
Good for HTML; probably not want you want for your fullscreen Flash/Flex app. Use the tag above to prevent scaling.