Added to the OP:
Calculate today’s trendline price HERE (http://www.wolframalpha.com/input/?i=10%5E%282.9065++*+ln%28%28number+of+days+since+2009+Jan+09%29%2Fdays%29+-+19.493%29)
Re: Logarithmic (non-linear) regression - Bitcoin estimated value
Figures: Trolololo