Bob's analysis as usual is thoughtful and insightful regarding the supply side of the economy, but there are a couple of other factors that I think should be noted.
1. What will happen with domestic consumption if the economy keeps growing? What has differentiated this current economic cycle is that at other times when Argentina's commodity du jour prices peaked (e.g., in '96 under Menem, twice during the last dictatorship, etc.) the profits for the most part left the country by staying in the hands of the wealthiest 8% of the population, never "trickling down". This has not been the case over the last 8 years, this time with lower sections of the population having a greater share in the bonanza, mostly in the form of jobs. For example Menem kept inflation down, but unemployment hovered around 20%, creating de facto inflation (if I have no income, everything’s price goes up for me). This round of inflation has not seen a decrease in the purchasing power of the median Argentine household.
2. Consumer credit. A large part of the current consumption boom is due to the fact that everyone has a job, but from my jaundiced view, too much of this consumption is driven by consumer credit, which is inevitably a gateway to finance speculation unless there are very strict market regulations (see Iceland, Ireland and the US).
3. Energy Growth. The bugbear of any rapidly growing economy (such as the Asian Titans in the Aughts) has been its ability to provide energy to growing industry. Unfortunately, the privatisations of the 90's devastated alot of the Argentine infrastructure and crippled the public’s ability to maximize its resources for domestic use.
So in all, there are issues that would need to be monitored, but an economy with an 8% annual growth rate and 15% inflation is not alarming for currency stability, especially in view of the low unemployment figures. And the proof of this is the way Argentina along with Brazil, Bolivia and other countries weathered the latest crisis up North. In fact, I personally would be much concerned about an economy like, oh I dunno… say the US with a frightening wealth disparity, a gargantuan public debt and high long-term unemployment.