Looks like I'm the only one not furious at all, probably because I had half expected the amnesia solution. Given that a) Catherine Tate was available for only one season, b) there was no way Donna would have left voluntarily - she enjoyed travelling, she had a happy, angst-free relationship with the Doctor, and c) amnesia can be undone far more easily than death if they can get Catherine Tate back. Doesn't mean it didn't break my heart, but I understood it. And I didn't see the character development in vain, either. We know what Donna can become, she did it twice, she will do a third time.

*off to the airport*