> They didn't have up/down, but a system of "Interesting", "Informative", "Off-Topic" and a few others. These are the same as up/down votes in the end, but make you classify postings.

I might be misremembering things, but I seem to recall that it was also possible to assign boost points to these in your user settings - i.e. so that Interesting posts would be treated as +2 rather than +1, for example.