"Of course, had there been just the smallest amount of cooperation in the RISC OS world, we'd have a feature complete Firefox 2.0 port right about now, and would have been using a complete Firefox 1.5 for some considerable time. But that's unlikely now as then."
I think you're being a bit hard on people here.
Most of us don't have the qualifications to help (This includes me; I don't know C++, or even C). Of those that could, probably some are working on other projects which might help, some don't want to make commitments they're unlikely to be able to keep (or enough to make it worthwhile), and some are just scared of you.
If you are actually looking for financial support (which the link you gave suggests but doesn't seem to be what you are saying above) then it would be helpful to indicate how much you want. Perhaps though your project is being tarred with the same brush as the various vapourware schemes. Probably unconciously, since you've clearly delivered on your proposals so far.
But it seems to me that your funding scheme was almost set up to draw minimum income, since the licencing requires you to give it away for free once it is made. So initially many people put off pledging money, waiting for something to happen. But IIRC (and I may not be), approximately at the point you released the beta, you indicated there wouldn't be further development, so these people didn't feel they'd gain anything by subscribing at that stage.
Please forgive me If I'm way off on this, I'm not out to cause offence. This is just my perception and I concede anything you can put me straight on.