Internet Archive (Wayback Machine, anyone?)

I mean I get that's a strange mention here, but with the value I've got from it (like being able to reference content of some website *in point of time* knowing it may change or even completely die) I somehow feel obligated to send at least a few tens of dollars per year. Also they have matching donations campaign around Christmas (at least that's how it was in recent years), so it's a nice idea donate right then.