My native roleplaying environment is in real time (MU*, IRC, et cetera), but the logistics of actually maintaining a regular schedule can be quite tedious — that's one of the advantages of forums; we don't have to plan individual sessions. I reckon it's better to keep to the forums in this case, personally, but I know very well the smoothness and verisimilitude that comes with writing a scene in a reactionary mode rather than a contemplative one.
Any preferences regarding tone/genre? Ought we go more pulpy or more dramatic? Something resembling slice-of-life or something emphasizing the technology elements? Political or action?