How can I connect headphones to an Optical Digital Audio Out port?

the only way I can think of is to purchase a A/V reciever with an optical input, then plug headphones into the reciever. viola!

I have seen a number of products on Amazon.com that might work to do the conversion I need.  One of them, for example, is called Optical Toslink to Coaxial (RCA) Digital Audio Converter.  Does anybody know if this type of converter would work here?

I don't feel like connecting another device to this TV -- it is already connected to an HDTiVo and a DVD/VCR player.

greenasp -- the adapter in that link has separate left and right outputs, and I need just a single mini-plug port.  Can you tell me if this one would work?
http://www.amazon.com/Optical-Toslink-Coaxial-RCA-Converter/dp/B002HWZN4W/ref=sr_1_2?s=electronics&ie=UTF8&qid=1281800748&sr=1-2
Or this one?
http://www.amazon.com/Optical-Toslink-Coaxial-Digital-Converter/dp/B001IGVHY8/ref=sr_1_3?s=electronics&ie=UTF8&qid=1281801229&sr=1-3

Here is another (more expensive):
http://www.amazon.com/Digital-Analog-Converter-USB-Headphone/dp/B0038HX3S8/ref=sr_1_1?s=electronics&ie=UTF8&qid=1281801294&sr=1-1

The headphones I currently use are Sony Mdr-As30G.

These are lightweight headphones, good for listening to audio books while walking or exercising; I would be willing to buy another set for connecting to the HDTV.

I  think you're barking up the wrong tree trying to convert a digital signal to analogue headphone level. All sound that hits speakers -- including headphone speakers -- needs power. The power from your optical output only carries the digital signal -- it wouldn't provide power to power your headphones. -- even a L/R (left right)  analogue audio output, which is a line-level signal-- meaning it's only about 1 or 2 watts. And it's only for going into another amplifier. Even if you converted your digital signal to analogue you would hardly be able to hear it without a small power amp to power the headphones.
One solution is to buy some wireless headphones and connect the wireless headphone transmitter to the red/white L/R audio output of your TV (I'm sure there's a spare one there somewhere) -- or you can use plugs to parralell one of the other L/R analogue audio outputs.
Another solution is to buy a cheap headphone amplifier and connect the spare L/R analogue audio outputs to that.

One of the devices I looked at on Amazon.com had an illustration of the setup sheet, and it showed headphones being connected to an Optical Digital Audio port.  A TOSLink cable connected the port to the device, and then the headphones were plugged into a mini-plug port on the device.  I have ordered this device, and a TOSLink cable, so I will shortly find out whether it works.

I will find out soon.

I got the DAC and the TOSLink cable, and connected the Optical Digital Audio Out port to the cable, and the headphones (actually an extension cable connected to the headphones) to the DAC, and after some fiddling, it works fine.  Originally I didn't hear anything from the headphones, but (to make a long story short), I found that when there is a cable plugged into this port on the HDTV, it doesn't cut off the TV sound (as it did on my old analog TV).  And the DAC has its own volume control.  So to get sound in the headphones, but not on the TV speakers, I had to turn down the TV sound to the lowest possible setting, and adjust the headphone volume on the DAC.

Thanks for the help, guys!