I always cringe a little when I see promises like this. I'm a big fan of under-promise/over-deliver. I'd much rather see "Posterous builds Ning blog importer" rather than a promise to do so.

Do they have an agreement with Ning? Otherwise... how do you scrape Ning at scale without them figuring it out and blocking your IP addresses? Tor?

No harm in giving people options, in a perfect world people should be able to easily move in between platforms. I know for a long time the better forum software have offered converters.

Very smart move, though I'm not sure if the demographics of ning users (As I know them) are a good fit for posterous.

I wish posterous would commit to letting me add javascript in my template.

Vultures circling or cutting out the fat? Time will tell.

Ning seems to be looking for ways to piss off its customer base.