>I've got an opto (6N135) that has a 8mA max output current. I need about
>100mA (at 12v). I can't find (at least a readily available one) opto that
>can do that. What's the best approach here? I'd rather not change the opto
>and the circuit works fine - just need more current.

use the opto to turn on a transistor? What exactly is the application?
i.e. what are you trying to turn on?