http://ios.e-lite.org/
Looks like it just showed up!! This site has direct links to the firmware images.
Edit:
The links were up, then down real quick. Here is the link I snagged for iOS 4.0.1 for iPhone 4:
http://appldnld.apple.com/iPhone4/061-8619.20100715.4Pnsx/iPhone3,1_4.0.1_8A306_Restore.ipsw
Edit 2:
Looks like 4.0.1 is back on the e-lite links and iTunes is also detecting the update now.
Looks like it just showed up!! This site has direct links to the firmware images.
Edit:
The links were up, then down real quick. Here is the link I snagged for iOS 4.0.1 for iPhone 4:
http://appldnld.apple.com/iPhone4/061-8619.20100715.4Pnsx/iPhone3,1_4.0.1_8A306_Restore.ipsw
Edit 2:
Looks like 4.0.1 is back on the e-lite links and iTunes is also detecting the update now.