I'll just add my voice to this type of request topic again

. I've already started one myself a week ago and replied in the thread eva mentioned.
I think we'll see the need for subscription/donation only increase as advertisement revenue just plain and simple sucks. And in order for members to be encouraged to do this is give them extra goodies they normally can't have, make them feel special over people who do not support the community financially.
JackG, I think pretty much anybody hates ad banners and especially pop ups (which now I am forced to use in order to survive) If somebody pays even as little as 10-15$/year it will probably generate more from that one user than any ad can. Why not reward them with an ad free browsing experience.
wluke, I hope you plan on releasing it as you are on the right track. This could be a VERY useful hack for a lot of forum admins. I believe that something like this could very welll save my site from going down a few months down the line, 35$ would be a small price to pay for your work and I'd be willing to test as well.