Thanks Fenne-Kun! To answer your question, I don't have my own soundfont. I use a variety of soundfonts and VSTi programs. For MIDI based compositions I use a Roland SC-55 soundfont and a Yamaha S-YXG50 VST XG plugin. For any more realistic remasters and enhancements I use the Native Instruments Komplete VST, and East-West along with Sony Acid Pro to edit the tracks. I use Izotope Ozone 4 for finalizing the mix and master for certain effects.
At one time, I was working on my own Pokemon DS soundfont which you can hear through this link. http://www.youtube.com/watch?v=MPzrdgSe3n0
The one thing my soundfont has that others do not have is proper sounding drums, and the instruments are in all in one file based on the General MIDI standard. The soundfont though is very incomplete, as it is missing certain instruments.