Some good points, think i'll have to add this one to the back burner.
Jack wrote:
You'll have to code it, because everyone has a different membership date. You could do it if you're server has a php friendly compression software loaded, but this can be a bit resource intensive depending on your load (also, I found that some people are really lazy, and will ALWAYS download the complete zip on every release, which can lead to bandwidth issues). In any case, it surely would be a nice thing to have.