to hpxieh :

Yeah, i also got my T3G around December and i've noticed that the button has "deepen" it also sometimes become less sensitive already. Don't think there's a solution for it just yet, still hunting around for a solution.

And i think there's a converter that HTC that allows you to change from the mini-USB to 3.5mm Audio Jack. Remember it's around 100+, but i think if u look elsewhere maybe can get cheaper convertor.