You have to admit it, Fastcoin has a catchy name. I think the marketing behind Fastcoin should exploit its prime feature: going fast.
I propose the following catchphrase:
"Go Fast" 
It's possible that this phrase is overused or possibly trademarked, in which case I suggest a subtle variation such as:
"Think Fast. Go Fast."
"Trade Fast."
"Move Fast."
etc...
In conjunction, clever imagery to tie in with the concept of 'fast':
-Racecars, jets
-sprinters
-horseracing, dogracing
Perhaps funny twists as well:
-a snail going really fast--flames and smoke--perhaps the snail has a fastcoin logo on it
-line of turtles checking out with fastcoin
-all grandmothers use fastcoin because 'they don't have time to spare'
-speed achievements: the wheel-->the three minute mile-->breaking the sound barrier-->fiber-optics at the speed of light-->Fastcoin
etc..
It might seem gimmicky, but the truth is gimmicks sell and jingles catch on and spread.
Any thoughts?
