I'm very interested in developing proper ext4 support, but I don't want to duplicate efforts. I'd be grateful to get in contact with any developers even if it's just for little bits of advice.
It's just one guy at the mo (bosse at acc.umu dot se) so no need for a mailing list I presume - no one to talk to!
Darn shame he's in Sweden probably so away from you. There a lot of duplication of efforts to get things going. In terms of ext4 support first we still need ext3 journalling. If we had this there would be another option to NTFS for a journalling filesystem shared on dual boot devices. As it is we only have ReiserFS support, which is very immature.
Here's what I mean by duplication of efforts. If only these projects could contribute to this one (which seems to be the most open and quite far down the road with it):
There's also at least 3 GUI based read only affairs but again this doesn't furher the cause and we're still stuck with NTFS for journalling.
A user thread discussing a little of this from 2007:
…and no doubt all the examples on this page are duplicating the effort, perhaps they could help: