See the links on the right under More like this.
Or type the words lion iweb file in the search field above.
Or copy this line :
and do Command-Shift-G in the Finder, paste and hit return.
Or use Google : http://www.google.com/search?q=show+library+folder+iweb
In Lion the Library folder is now invisible. To make it permanently visible enter the following in the Terminal application window: chflags nohidden ~/Library and hit the Enter button - 10.7: Un-hide the User Library folder.
For opening your domain file in Lion for the first time or to switch between multiple domain files Cyclosaurus has provided us with the following script that you can make into an Applescript application with Script Editor. Open Script Editor, copy and paste the script below into Script Editor's window and save as an application.
Just launch the applicaiton, find and select the domain file you want to open and it will open with iWeb. It modifies the iWeb preference file each time it's launched so one can switch between domain files.
do shell script "/usr/bin/defaults write com.apple.iWeb iWebDefaultsDocumentPath -boolean no"
tell application "iWeb" to activate
Or you can download an already compiiled version with this link: iWeb Switch Domain.