I am a multimedia developer. Most of my work is training applications. Occasionally I use Flash, which can, as we all know, be used to develop content for PC, Mac, PocketPC, many phones, and numerous other devices. The fact that the developer can use the same skills to develop content for so many different devices is a valuable strength for Flash.
Similarly, Java can be used to develop for numerous platforms, supposedly with no need to modify the code between platforms - although we all know that's not true
I am happy to see attempts to make .NET CF more widespread too. OK it would be great if the latest SP of CF2 were supported, but it has to start somewhere.
Phones, PDAs and other devices are becoming more powerful and more useful by the day. Developers crave the ability to build applications for all of these devices without having to learn a new tool for each, and without having to maintain completely separate code for each. This will open the door to many more developers to develop content for popular phones.
To cut a long ramble short - long term I see CF on Symbian phones as a good thing.