Visitors > Mobile > Mobile devices
... mine is 4.85% of site total
with 46% of that being Android
I wonder if a 5% is a good number for thinking about a mobile style. Also, I wonder if this is a chicken and egg problem (meaning, people don't use their mobile to browse the forum because it is not optimized, and I do not optimize it because the usage is not that high)
What is your number?