Flash for the iPhone 4 (& apparently also other iOS devices with an ARM Cortex-A8: the 3GS, iPad, and 3rd Gen. iPod Touch). Note: the
device must be Jailbroken.
http://gizmodo.com/5607678/install-flash-on-an-iphone-4
http://www.redmondpie.com/install-fl...o-video-guide/
The above requires installing OpenSSH & doing things "the long way". If you install OpenSSH, you really should change your default SSH password, & use something like SBSettings to give you the power to enable/disable OpenSSH at will.
http://modmyi.com/wiki/index.php/SSH_on_Windows
Easy method, via adding a new source to Cydia:
http://modmyi.com/wiki/index.php/SSH_on_Windows
(beware of sources you do not know, etc. etc.)
Very very early stages, & does not work for video yet, just basic stuff.
I haven't bothered myself...I don't like or need Flash.