WaPo Unveils Free-to-Paid App

The Washington Post has introduced an iPad app with a subscription option, apparently answering a sticky issue publishers have had with Apple.
 
The Post’s app is free for now, but a payment plan will kick in in mid-February, when subscribers will be charged $0.99 per month and nonsubscribers, $3.99 per month.
 
Magazine and newspaper publishers had high hopes that the iPad would open up a new consumer revenue stream at a time when their print revenue has been sharply eroded.
 
But