First of all thank to orByte for the method to correct USBEHCI driver
http://forum.insanelymac.com/index.php?showtopic=28559
He is disappeared making only version 303 that is not enough.
I open new topic because I can't update orByte's topic with new version.

Previous my correction USB308 works!
Now sources 315.4.1 is available at Apple's site and I can easy rewrite it by orByte's method.
This is corrected sources and my compilation. All targets can be compiled except IOUSBFamily and IOUSBLib. Use stock similar.

EDITED 03.08.08
My kexts are not tested yet so be ready to return to version 308.

EDITED 21.11.08
I corrected EHCI and UHCI plugins for sleep support
Instructions how to install

That's all!

EDITED 19-09-2008
Apple publish 10.5.5 sources. IOUSBFamily is the same but IOUSBMassStorageClass is updated!
There is my compilation with small corrections.

EDITED 19-12-2008
New compilation from 10.5.6 sources. I change version to 3.2.8 to differ from Apple's kexts.
What new? I add support for Intel ICH4-5, 9 (ICH10 added by Apple), NForce (MCP79 by Apple, MCP78 and other by me), SIS7001.
Some internal mistakes corrected.
All files tested in 10.5.5 so it compatible with old systems (Leopard only!).
You also may try my IOPCIFamily.kext v254 to improve interrupts handling.
 AppleUSBEHCI328.kext.zip ( 50.13K ) Number of downloads: 6358

 AppleUSBOHCI328.kext.zip ( 36.61K ) Number of downloads: 4511

 AppleUSBUHCI328.kext.zip ( 46.8K ) Number of downloads: 4740

 IOUSBMassStorageClass205.kext.zip ( 32.45K ) Number of downloads: 6211


EDITED 18-05-2009
New compilation from 10.5.7 sources. Now version is 3.4.4. This version include all previous fixes, new DeviceIDs and forced sleep capabilities even if it is not really supported (as discussed with Hafnium).


EDITED 28-05-2009
Add support for ICH10R DeviceID=3a6x

EDITED 26-05-2009
If you see error at startup

then it is not USB problem. It is a problem with interrupts in whole system.
If USB sometimes works, sometimes no then it is the same problem.
To solve it, download my new IOPCIFamily v2.6.1 (from my signature). It may correct such problems!

EDITED 01-06-2009
Add support for NForce DeviceID=36d
Compile new USBProbe
 IOUSBFamily_343.4.4.zip ( 1.47MB ) Number of downloads: 4382

 IOUSBFamily344_2.kext.zip ( 701.58K ) Number of downloads: 5598

 USBProber.zip ( 407.61K ) Number of downloads: 2917


EDITED 15-08-2009
Version for 10.5.8 is here

Important
sudo rm -r -v /System/Library/Extensions/PCGenUSB*
sudo rm -r -v /System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/PCGenUSB*