I just want to let everybody know that with out sound and internet... Mac OS X on your Intel is almost useless... I want to give props to those hard working programmers with the struggle to get hard ware drivers out there for everybody to use, but however for those who cannot wait until this dream becomes a reality, I give you a few easy and completely inexpensive tips on how to get these functions working flawlessly.
Now like you, I tried downloading all of these tricks offered on here and for the most part I ended up screwing up my computer, and so I took a little trip to eBay (the world's largest market place) and did some searches...
for sound I put in the keywords: "mac usb audio" and came up with a title listed as "Better than Griffin iMic: USB OS X & PC audio in/out" Now i guess you could also go for the iMic but i just want to let you know the one I bought was incredibly small (no bigger than a jump drive) and is completely "plug and play" just hooked it up and OS X recognized it in the audio/sound prefrences!
for wireless internet (for use with my router) I put in the keywords: "mac usb wireless" and came up with a title listed as "Airport card adapter Mac Wireless 802.11 B G USB Apple". This one took a little bit of work to install it but after i got it to work... it was smooth sailing, and it is also no bigger than a usb jump drive!
BOTH WERE EXTREMELY CHEAP AND BOTH WORK! IN TOTAL I PAID ABOUT $75 AND WITH THE CURRENT COST OF A POWER BOOK BEEING ABOUT $1300 I WOULD SAY THAT IS AN EXCEPTABLE DIFFERENCE!