Currently we are in the "that will show em" stage... the same people responsible for the bubble have declared a tow war against bitcoinca, Ignoring their sunk costs they are trying to further increase artificial scarcity by buying whenever they can.
Uhm, that would be strange. The people who drove the bubble with their money probably don't have a lot of purchasing power left, and I think they've been neatly disillusioned.
I think it's people like me, who were going
against the bubble and just buy back their coins now. On top of these, there might be hobby-speculators who are afraid of he down-trend and only buy back now because it has significantly weakened throughout the last month -- actually, comparing current price to 1 month ago, it might be stopping completely. A lot of people like following trends.
I'm not so much into the whole short-term and trend stuff though. I think Bitcoins are worth more than 3 USD, so I buy/hold when the price is below. I'm not terribly angry if I have to wait a while until it works out.
BTW, @Topic: it really depends on the price and situation for me. I buy slowly, to be less sensitive to swings, but it really depends on price and indicators just how much.