Around 3:40 PM (PST) today, US-West ADV experienced MAJOR server-wide lag. My netgraph was showing that I was getting around 50% packet loss during the spike (lasting about 15 seconds). Everyone on the server had their ping increase by at least quadruple of what they'd had before.
I don't think that this was just an anomaly though, since this has been happening throughout the past week-ish. If this isn't an anomaly, it would be nice if the problem could be identified and/or fixed.