What is a good site to learn how to do these? Can it be down in Photoshop or Image Ready?

This may help: http://www.google.com/search?hl=en&q=l...G=Google+Search

I don't know if you can make drop down menus with Image Ready, but maybe Flash.

I think there is a good tutorial on http://dynamicdrive.com thats how I did the ones on my site ( http://ecc.xlayoutsx.com )

To add to these comments, how comfortable are you with coding? There's going to be some element of programming involved more than likely unless you have access to a program like Dreamweaver.

I would recommend looking over this specifically - http://ypslideoutmenus.sourceforge.net/

Click "download" to get it, it comes in a zip folder and maybe if you read over the forum link it'll help you get started.