I bought 100 BTC (the smallest amount possible).  To give you a flavour of trading back then, here's the complete list of trades which took place on 12 July, 2010 on the exchange I was using:

                    Rate   Amount
    Time       (USD/BTC)    (BTC)
    -----------------------------
    08:28:10      0.0120      200
    10:26:03      0.0120      100
    11:21:43      0.0100     4300
    11:48:46      0.0119     5000
    13:01:49      0.0120     4700
    13:10:19      0.0130     1000
    13:37:45      0.0130     2500
    13:44:11      0.0130      500
    13:46:22      0.0135      100
    15:34:46      0.0140      500
    16:41:31      0.0135      400
    16:43:46      0.0140     1000



Thank you but I think the hat should stay on.  I sold most of my bitcoins about 10 months later at around 8 USD/BTC.

Buying is easy, holding for years is hard.