I just bought a SciPhone G2 Dream and have done some initial investigation. This particular phone runs J2ME applications but I am also wondering what can be done (if anything) with native applications. Ideally I would like to get my Bluetooth GPS to work with this phone.
This page discusses getting GCC to work with Nucleus but I'm not sure whether this is useful.
Mentor (the makers of Nucleus) have a trial version of their developer suite available. I have just requested a free trial. It is a bit concerning that the website makes no mention of the cost. They also have an emulator.
What sort of phone did you get and what sort of applications are you planning to develop?