Okay now that we have passed the legal dept. and arrive at the players, it's my turn
Mark is a bit behind with his iPods and video players etc.

What you really want is wireless streaming that content directly from your computer (laptop) to the TV or stereo.
For music, good systems are Squeezebox or Sonos. I have the Squeezebox system (now owned by Logitec) but today Sonos might even be a better option. The music player does not store your music like an iPod does... it receives your music over wifi from your
laptop, translates it from digital back to high quality (much better than
laptop sound card) analog and puts that to your stereo/amplifier.
For TV/Movies, AppleTV is a good candidate. It even allows streaming from an iPhone or iPad if you want (or just show the screen like a presentation mode (big Skype screen

). This is called "AirPlay" mode.
These systems require that you have a standard wifi router to take care of the wireless links. Yes, the same el cheapo used at home works here too. If you're smart, you use an Ubiquity PicoStation M2 for this and link that directly to your Ubiquity Bullet or NanoStation for your
Internet link.
ciao!
Nick.