Impure Adulation
Well when River talks about her death in the end of Forest of The Dead, she says that the Doctor comes to visit her once in a while, so it is possible that in one of those visits he finds something wonky with the computer and an adventure could ensue. Also I don't think that River will ever get out of that computer. If she some how does, it would mean that she would have to be given a physical form that would eventually perish or die. This way River is forever saved on the computer and the Doctor wont ever have to worry about loosing her again.
I completely agree.
And of course, I didn't mean to imply that River could escape the computer by any means. She's definitely dead, her physical body was fried. What remains of her is merely a memory. However, I could definitely see the Doctor visiting her at some point, if only to tell her goodbye properly (considering the last time he had the chance to say goodbye, he didn't even know who she was yet).