Here's an extract of a conversation between myself and a friend which
(hopefully) highlights why good UI design is important to encourage
contributions.
[13:03] Roman: argh how do I upload a new version of an image without
re-typing all of that text on the upload form?
[13:04] Timwi: I don't think you need to retype it all
[13:04] Roman: i really expected an "upload new version" link on the
image page
[13:05] Roman: I can't expect it to preserve the text fields if I don't
type anything
[13:06] Roman: see, i wanted to make a tiny improvement to an image
that's already there, but now I won't do that because it's too hard