My Epson perfection 3490 photo scanner doesn't work on leopard. It worked fine on tiger. Do I need to download new software? The CD that came with my scanner says it is for Mac 10.2 to 10.4.

I googled Epson support and found the answer. Here it is:
Macintosh Leopard Support Contact Support
Welcome to Macintosh OS X 10.5 Leopard support for Epson products. Here you can find out how to get drivers and other Epson software for your Epson product that work with Macintosh OS X 10.5.
Check your Epson product CD to see if it already contains Macintosh OS X 10.5 drivers. If the CD indicates support for Macintosh OS X 10.5, follow the instructions that came with your Epson product to install your drivers and other software.
If your CD does not list OS X 10.5 Leopard, follow the Step-by-Step Instructions below.
View our Macintosh OS X 10.5 Leopard FAQs.