First, I'm not trying to suggest that everything is rosy for Nintendo. They need (and appear to be moving towards) some significant changes in the near future. However, the report isn't as gloomy as some people are making it out to be.
Any comparison of annual numbers vs the first six months of 2010 should be thrown out. Nintendo has enjoyed massive, record-setting holiday seasons for the past several years. That might not happen this year... but there is no reasonable evidence to state otherwise. Year-over-year numbers for the same period do show a notable drop though, and that is something to consider when 2010 has already seen a handful of big releases like Monster Hunter, Mario, Tatsunoku vs Capcom, and Metroid.
However, posting a loss now is hardly surprising if you consider that two platforms are likely to be retired in the next couple of years. Nintendo must have costs associated with development, design, and production of the 3DS and the Wii successor; costs that will only be balanced out by future sales of those systems. The only question is how much is actually being invested and whether their next consoles will be as popular as the current ones.
So even though it's interesting news, it's hardly something to get your Princess Peach panties in a bunch over. Nobody bats an eye when Sony or Microsoft swallow huge losses as long as they call it an investment for future sales... all while Nintendo has milked this generation of gamers (and non-gamers) for ridiculous profits at the same time.