Hey, nice thread!
I remember the old green nalicity, and the daily map lists. Man, looks like it's been ages...
I also frequented "headshot" in my newbie days. There were many crap maps on that site, though. Although, I did run into a few interesting maps (wintermappack esp. snowing angels etc. and "sudden death". Map based on a real life location, yes. It was laggy, laggy, laggy on my old machine! Laggy as hell. But I couldn't resist, I just loved playing this map. Good for teamgames. Steer clear from the central area and let the bots frag eachother in the cage
...)
So far I recognise all sites you've mentioned. UT machine used to be my main source for skins/models (and polycount). Then I stumbled upon skincity, and forgot about ut machine....