Planet13 - 1:00 am on Aug 19, 2013 (gmt 0)
"Also, once you disavow links, will they disappear from the WMT "sites linking to you" list, or do they stay there?"
I believe they stay there.
John Mueller explained the disavow process as similar to adding a nofollow to the link.
Since nofollow links are listed in the WMT links page, I don't see why disavowed links wouldn't be listed.
But I have been known to be wrong before.
"As in, does google "remember" your previously disavowed links, or do you have to keep them on your list, ad infinitum?"
From what I understand, google looks at the current state of the disavow file when "baking the data into the algorithims" so yes, you would have to keep the original disavow file and just add to it.