Yes, there is a way to use the new iDisk sharing feature to share multiple files at once. It can be done easily using the Compress command in the iDisk web app.
Here’s how:
1) Select the files or folders you want to share. (To select multiple files hold down the Command key on a Mac or the Control key on a PC as you click on each one.)
2) Use the Actions menu via the Gear icon in the Toolbar, and select Compress items. This will automatically create a single compressed file named Archive.zip that contains your files or folders.
3) Share Archive.zip file just as you would any other iDisk file. (Before you share it, you can change the “Archive” part of the name to something more descriptive, but keep the .zip extension so the receiver’s computer will know to decompress the files when the receiver opens it.)
Source: Apple Inc.
[Thanks to MacDailyNews Reader “Peter F.” for the heads up.]