I just got an E-P3. Optech has a lot of different solutions for what you seek. I used them with my D300 and will use a similar set-up with my E-P3. Although I'm looking to buy a quick release one that detaches quickly for the camera like the one on my D300. Unfortunately that one does not fit the E-P3 But i can still use the same quick release neckstrap.
This is what I'm going to use on my E-P3 for the time being. Eventually I will add a quick release module like I used on my D300. But i can use the same neck strap on both cameras.
Here's all the system connectors you can buy so you can customized your strap to your liking. I love Optech.