not to be blunt but if your thinking of a single sign on system why not use a single system (ie joomla) to handle it all instead of patchworking all these little systems together through bridges and hacks which makes even a simple future upgrade (ie security) a nightmare as you fight with rehacking stuff and opps bridge 1.2.1 doesnt work with front end 1.1.2 and etc
count me in on helping too (if that were not evident)
(and for the record I have had the smf converter working for yabb 2.2.3 for a few months now, whenever it was you put up that poll / test forum 
though its not perfect, its never perfect)