I’ve found a handy little plugin for Photoshop that lets you save files out in the .ICO format – handy for making favicons for your website!

http://www.telegraphics.com.au/sw/

Download the “ICO (Windows Icon) Format” in Mac or Windows format, unzip and copy the “ICOFormat.8bi” file into your “File Formats” plugin folder located in “C:Program FilesAdobeAdobe Photoshop CS3Plug-InsFile Formats”. If you have Photoshop open, save your work, close it and start it again.

You should now see “ICO (Windows icon) (*.ICO)” in the “Format” menu when you try to save a file.