At my home, I have a Linksys WRT54G2 v1 router. I bought a refurbished Linksys WET610N bridge from linksys.com ($54 instead of $90 for a new one).
I put in the installation disk into my desktop computer and followed the instructions (plugged the bridge into the back of the router, etc) and I got an error message (#107, I believe). I called linksys support and since the bridge was under warranty, even though the router wasn't, they helped me. If you are not technically inclined about routers, please buy one under warranty. If you don't, you'll have to pay $29.95 for them to take your call, negating the savings from buying a used one off ebay. Also, I have heard (in this forum too) that if you download DD-WRT software to convert your bridge to a router that the picture is not as good. I can't confirm that, but I can tell you that it voids any warranty/support for your router. Just buy the bridge and set it up the way it was intended.
Anyway, he remotely took over my PC and took care of all of the settings of the bridge, did a firmware update on my router, and then had my plug the bridge into the back of the TV's ethernet port. At first, it didn't connect. They I went to the network settings and he walked me through the DNS, Gateway, etc AND IT THEN WORKED!
Pandora.... AWESOME. Amazon On-Demand.... watched a free trailer for "V - The Series" and I couldn't believe the video quality. YouTube, Weather, and Picasa look cool too. Fox Sports and Twitter say "coming soon." There is no widget for Netflix yet.
Anyway, there is my experience. My only question is this...... Currently, I had HDMI cables only running video to my TV from my Satellite receiver and BD Player. I had sound running directly from the satellite receiver and BD to my stereo receiver (one was an optical cable). That obviously didn't work because there was no sound coming out of the TV and into the stereo receiver. I wanted to keep that arrangement and just run audio cables from TV to the stereo receiver via another input jack. It wouldn't work since the sound from the TV input can only be generated from one source. It's not a big deal, but is there a way I could establish a different audio source for Viera Cast than when I am watching Satellite TV? I doubt it, but I thought I would at least ask the question.