Dave Pearman , Nov 03, 2006; 08:49 a.m.
The P30 (P3 in the USA) was the original model, and offered a program mode with KA lenses, plus manual. The P30N (P3n) added the option of aperture priority auto exposure as well. The P30T is like a P30N but in a titanium colour finish. There may be other minor difference that I've forgotten about! Don't know of any other models, though there may have been some Special Editions?
There's a good summary of the models here:
...and you can download the manuals for the P3 models here:
Hope this helps!