user2349: Understanding the motivations for the 21 million BC limit and halving reward rate, I still think it dis-proportionally rewards early adopters. My ideal system would be one where the mining reward is a factor of the work done which would mean as the system increases in popularity (i.e more miners) the corresponding mining reward would increase. This would have a stabilising effect on the price and provide people a reason to spend coins rather than hoard them. Anyone who has tried to work or sell goods in BC's would see the problems it is facing as a currency rather than a commodity. Does anyone know of a Bitcoin alternative with these properties? 

user2349: Freicoin also accomplishes this but in a round about way. Rather than adding new coins to the system to pay miners, it removes coins from each account to pay miners. 
http://freico.in/how/

user516: PPCoin appears to have a non-reducing block reward, so that might be what you're looking for.
Other alternative cryptocurrencies are listed, with some info on their properties, here:
https://en.bitcoin.it/wiki/List_of_alternative_cryptocurrencies

2349: <p>Understanding the motivations for the 21 million BC limit and halving reward rate, I still think it dis-proportionally rewards early adopters. My ideal system would be one where the mining reward is a factor of the work done which would mean as the system increases in popularity (i.e more miners) the corresponding mining reward would increase. This would have a stabilising effect on the price and provide people a reason to spend coins rather than hoard them. Anyone who has tried to work or sell goods in BC's would see the problems it is facing as a currency rather than a commodity. Does anyone know of a Bitcoin alternative with these properties? </p>
 2349: <p>Freicoin also accomplishes this but in a round about way. Rather than adding new coins to the system to pay miners, it removes coins from each account to pay miners. </p>

<p><a href="http://freico.in/how/" rel="nofollow">http://freico.in/how/</a></p>
 516: <p><a href="http://ppcoin.org/" rel="nofollow">PPCoin</a> appears to have a non-reducing block reward, so that might be what you're looking for.</p>

<p>Other alternative cryptocurrencies are listed, with some info on their properties, here:
<a href="https://en.bitcoin.it/wiki/List_of_alternative_cryptocurrencies" rel="nofollow">https://en.bitcoin.it/wiki/List_of_alternative_cryptocurrencies</a></p>
