I had to take some time off this morning to run Dad over to the local Target where I saw a nice end-cap display of the Sony PRS-505. The price was good too, but of course as of today, the PRS-505 is old news. Sony announced the expected successor: the PRS-700, which should hit stores next month. There’s a price increase for the upgrade of course; look for the 700 to retail around $400. So what do you get for the extra money?Aside from a minor external redesign, there’s a touchscreen and an LED sidelight. The light alone might convince more than a few to purchase or upgrade. As far as the touchscreen, I’m on the fence on whether or not the extra price justifies the feature. I’m guessing the touch technology is adding a good 10% or more to the overall price, but does it add 10% or more functionality? I’m thinking not, although I’m sure some would argue. Here’s why: you can flip pages with the touchscreen and you can highlight passages using the stylus and touchscreen. No handwritten notes, at least not by the touchscreen; for notes, you have to use the on-screen keyboard.There’s something to be said for touch with the user interface and overall experience of course. However, I’d personally like to see more functionality from the touchscreen expense. Perhaps this will come in the form of a future software upgrade?