Hi!
I write this when I managed to make the sound working on my x60.... (a lot of info came from other forums)
You can use any editor, I used to work in VI.
You should make a backup from all the following files... (it worked for me under OS X 10.4.8, now I dont have OS X on my X60s)
"
1. Delete AppleHDA.kext:
* In Terminal, type: sudo rm -rf /System/Library/Extensions/AppleHDA.kext
* sudo rm -rf /System/Library/Extensions.mkext
* sudo rm -rf /System/Library/Extensions.kext
2) Edit AppleAzaliaAudio.kext:
* In Terminal, type: sudo -s
cd /System/Library/Extensions/AppleAzaliaAudio.kext/Contents/
vi Info.plist
<key>IOHDAudioCodecVendorID</key>
* change the string to (you must type e to enter edit mode):
<string>0x10ec0882</string>
:w
:q
cd
/System/Library/Extensions/AppleAzaliaAudio.kext/Contents/PlugIns/AppleAzaliaController.kext/Contents/
vi Info.plist
<key>IOPCIPrimaryMatch</key>
* change the string to:
<string>0x27d88086</string>
:w
:q
3) Clean up the system:
* In Terminal, type: sudo kextload
/System/Library/Extensions/AppleAzaliaAudio.kext
* kextcache -k /System/Library/Extensions/
4) Then, reboot and enjoy sound out of two channels.
"
Maybe you need repair permissions..
(diskutil repairpermissions /)
I hope this can help you!
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If you have atheros card in your x60, I have a configuration file for that. It works flawlessly, because the Macbook Pro uses the same Atheros card as the thinkpads (40Y7026).
PM me if you need.
Or I write it as I did (get the infos from this and other forums):
"
Wifi:
You must purchase and install the "ThinkPad 11a/b/g Wireless LAN
Mini-PCI Express Adapter"part #: 40Y7026) (You will need this if you have Intel 3945 card in your thinkpad)
1) After this, you must download the Apple 10.4.5 intel upgrade available
here (300mb):
http://www.apple.com/support/downloads/ ... intel.html
2) You must also download a program called Pacifist (available here:
http://macupdate.com/info.php/id/6812 ).
3) Install Pacifist and double click on the apple upgrade to mount it.
4) Next, open up pacifist and browse to the file inside the mounted
image called "MacOSXUpd10.4.5Intel.pkg".
5) After it opens, click "find" and search for "IO80211Family.kext".
Drag that file into the folder: "/System/Library/Extensions/"
replacing any pre-existing files.
6) sudo -s
$ chown -R root:wheel /System/Library/Extensions/IO80211Family.kext/
$ chmod -R 755 /System/Library/Extensions/IO80211Family.kext/
$ diskutil repairpermissions /
$ rm /System/Library/Extensions.kextcache
$ rm /System/Library/Extensions.mkext
$ reboot
"
After this I had my wifi worked well...
Many greetz 
