I played with the demo for about 5 minutes and didn't find it to be of any use whatsoever when it comes to SP Midi.
I have been using the Nokia Audio Suite inside Cubase SX, and short of a few niggles and not being able to get the midi vibra control to work yet, I've found it pretty useful. (top tip though: do all your editting FIRST then start routing signals to the tool!)
Its looks and performs really badly but did seem to do the job of converting midi to SP Midi. It claims to do SMAF too but I've not been able to test the results.
Thing is, I registered it and have had very little luck with the full version. While the demo restricts the length of the files it exports, everything seemed to work. Now I have the full version I've found the files it exports either crash the phone, hang the phone or are unopenable.
What this software DOES do really well is allow you to easily set the instruments, which is a right pain in cubase using the nokia audio suite (its easy without the tool running!)
I'm currently using Reason for all my midi editting, as I really like it's no nonsense approach, then Mobile Music Polyphonic to set up instruments and finally Nokia Audio Suite in Cubase SX to tidy everything up and do the final export. Its a long winded process but the results are pretty good.
The only thing I'm still busting my nut over is how to get the Vibra alert to trigger through MIDI. I've mailed off a file to Enstedt for analysis but if anyone can mail me a midi file, or a cubase project which contains the correct set up for midi vibra control I would be most grateful.