These days I use only Parker Quink blue and black, because these are the most very easily obtained where I am (the Hero ink used be widely available as well but sadly I don't see them around anymore).
Top to bottom (and below right to left):
Pilot (vintage? unknown model number), Unknown pen (but I refer to it as Iridium Point as per marking on nib, using it as a dip pen now), Aurora (unknown model number), Hero 331, Parker Sonnet (the smoothest and wettest of the lot), Parker Urban (quite a horrible nib for such a heavy pen).
The doodles below are done on thin white paper, about 6x4 inches.
Edited by choen, 23 September 2010 - 10:01.