Flash Lite 3 Developer edition is available for download on the Adobe site. The Flash Lite 3 has been certified by Adobe for the Nokia N95 (it's my phone :)). Anyway it should work on any Nokia S60 3rd edition or later devices.
As you can read from the site :
This version of the Flash Lite 3 Developer Edition is not locked to the serial number of the device, you don't have to provide your IMEI number to download the installer. This installer has a startup screen indicating that it is the Flash Lite 3 Developer Edition. Devices that will ship with Flash Lite 3 pre-installed will not have this start up screen in their standalone players.
The first shipping devices with Flash Lite 3 pre-installed will be Nokia S60 models and will be available in Q1 2008.
The first shipping devices with Flash Lite 3 pre-installed will be DoCoMo’s 905i series, available now, and Nokia S60 models, which are scheduled to be available in Q1 2008.