Divergence numbers in logo: Steins;Gate easter egg?
As Eric notes in the comments, 0.571024 (the number down the side of the "i") is the divergence number of the worldline Okabe is in at the very beginning of the show. 

The numbers hidden in the letters (0 in i / 4 in n / 8 in s / 5 in G / 9 in t / 6 in e) form "048596". I bet there's a "1" hidden somewhere I'm not seeing (maybe in the first "t"?), since 1.048596 is also an important divergence number: that's the divergence number of the Steins;Gate.