I haven't seen this mentioned anywhere but it seems like a worthwhile charity (even though I'm not exactly sure how the recipients get their data.
The only drawback seems to be a limit of 20Gb a day (2 x 10Gb) which can make the process a bit fiddly for those with more available.
Well done Optus
We have a Donate Your Data FAQ page up on the forum. It's a great initiative!
Last I heard, we'd received over 1500 donations since the campaign launched earlier this morning.