The Wall Street Journal noted this morning that Sony's rather quietly dropped the price of its Pocket Reader about $30 to $169. Now, it's actually what amounts to a sale -- the price cut lasts only through April 4th -- but that date, just two days after the iPad is made available, could give us a little insight into the timing of the drop. The Wall Street Journal also posits that this could be the first in a series of price war moves in the single purpose e-reader market which are now facing competition from multi-purpose devices such as the aforementioned iPad and the recently announced Kindle app for tablets.