A new coin has come out that addresses the inflation vs dollar valuation issue. Ela coin is going to launch in like, ~8-9 hours from now, and it increases the block reward based on the network hashrate, as more people mine, each block becomes more valuable. It's not a straight 1:1 increase, but I still think it's a bit over the top. But it's nice to see that people are actually trying

This is a nice idea, but it is a) an extremely resource intensive b) unlikely to have major effects on price volatility. c) undermines the PoW security model
PPCoin employs the reverse algorithm, increasing generation when difficulty is low and decreasing generation when difficulty is high. Nonetheless, PPC prices do not seem to be more volatile than other coins. (I think but someone with spare time should do a statistical analysis.)
To credibly address price volatility, you need to introduce derivatives and multiple units of account (coin types) into a single blockchain. One coin can maintain a stable value, while another hypervolatile coin absorbs changes in market capitalization, a third coin may be necessary to allocate the ability to intervene in the monetary system. Holders of the third coin would be paid base on txn fees generated through the use of the stable coin. At the same time, they would be required to make markets for speculators trading in and out of the stable and volatile instruments.
Obviously it is going to be complicated. Stability is likely too ambitious an aim for netcoin.