Here are direct download links for iOS 4.1 for iPhone 4, 3GS, 3G and iPod Touch 3G & 2G. A reminder again that you should not update to iOS 4.1 if you rely on carrier unlock in particular as upgrading to iOS 4.1 will update your baseband. For all others, here are download links
iOS 4.1 Direct Download Links
Once downloaded, you can install IPSW manually. Alternatively, you can update from iTunes directly by hitting on the update link.
