It's all a game happily and for the uninitiated, they have no idea what the heck is going on. In short, the yen strengthened a little to hold off the recent rally in silver and gold which brought their price down substantially recently, but it will not last long.
Weather Bush signs a law into effect or not for the mortgage crisis, it will not do anything for the dollar. As long as the FED keeps printing money to bail out the lenders and securities firms, with nothing to back it up and at taxpayer expense, and they keep lowering interest rates, the dollar has nowhere to go but down, down, down. Especially if the FED releases all lenders of their financial responsibilities by buying up these bad mortgages at taxpayer expense.
When that happens, look out for the US economy and USD. They will spiral downward the likes of which has not been seen since the Great Depression of the 1930's
Remember, the FED stopped publishing
M3 figures 2 years ago. (M3is the total number of USD in circulation. This figure was used by other countries to set their exchange rates.) Since they are no longer published one can only guesstimate and since Bernanke is printing digital money at breakneck speed there will be more and more inflation in the US as a result. Just click the link for a quick education.
With US treasuries interest so low now who would want to invest in the US when they could get better interest rates elsewhere. Besides, interest rates that the FED charges and pays will probably be near 1% by the end of the year.
IMO if one has yen and is thinking of converting it into USD I would hold off as it will be near 90 in the near future and probably near 80or lower by the end of the year.