3.5mm Stereo Headset Adapter for S500i/W580i. This is a must have accessory because the headset that came with the phone is very cheap. You are better off using your own headphones for sure! This is what it looks like:
It's pretty cheap too ~ only 75 cents:
http://www.amazon.com/exec/obidos/tg...=UTF8&v=glance
And of course the micro travel charger:
http://www.sonystyle.com/webapp/wcs/...uctId=11033896
The nice thing about this is that if you're in an emergency you can use batteries to charge the phone as well! It's very small too.