Neat Receipts is coming out with a Mac version "soon" (was supposed to be this month, now it looks like April--it's in beta now). I use it on the Dark Side, and I can't recommend it enough. They have, just a card scaner as well, but the big one does cards, too, and imports into ACT!, Plaxo, csv, Outlook. I love it!
I have the same problem, but in any case DO NOT BUY the IRISCard system: I believe I have never used such a bad software in my life !!
It is buggy, completely unclear and the most logical operations are not there: it does not even seem possible to easily scan a load of cards and save them easily to process them afterward. I think I will just throw it away: Useless!!