I'd like to know if there are wireless, remotely powered speakers I
can buy for my laptop. If I could wirelessly send data across the room
to a speaker system that would receive that data and play it. I
imagine these speakers would have their own amplifier and power
source, so good volume can be achieved regardless of the low energy
signal comming form the computer.

This is an offshoot form a recent question, and that ishallcallu-ga
was perhaps speaking of this type of system. Although he may have been
referencing unpowered speakers with wires.
://www.google.com/answers/threadview?id=587046

I've heard that TV surround sound systems don't need wires running to
the back speakers anymore because the data can be sent wirelessly. And
that perhaps bluetooth technology enabled that capability (don't know
if this is the case though).

I have a WinXP system.
Thanks in advance for any and all help.
Patrice

Go to http://search.ebay.ca/Wireless+Speakers_W0QQfnuZ1QQfromZR8QQfsooZ1QQfsopZ1QQfsprZ1

http://www.newegg.com/Product/Product.asp?Item=N82E16836121120
They are 220 dollars, but very good quality. And wireless.