There was SIFcoin (Simple Inflation Fork of bitcoin). Network is still alive, but activity is very slow and no trading at all.
There is thread somewhere in this forum section.
I'm not familiar with foocoin jargon, can you tell me what implications
"Dif retarget: every block, +-1% of mean last hour" has in terms of actual inflation?
Also there's quarkcoin, which I gather is a descendent of sifcoin? Unfortunately, despite being much more popular it seems to have added back in the gold rush mentality, which for preference is something of a non-starter.