MONFAM I have been trying repeatedly to get my CanoScan LiDE 70 and the CanoScan Toolbox to work with my iMac and MacBook, both of which are running Leopard. After re-downloading drivers, toolbox, etc., multiple times, I still had no success. Every time I click Scan in the toolbox, I'm told that it can't find the driver, even though I know that the driver is installed.
I finally came across this great tip. While I'm not sure how to find the plug-in for scanning to Photoshop CS3, this post gave me the idea to try scanning directly in Photoshop. After opening my PS CS3, I went to File>Import and sure enough, the LiDE 70 was listed as an import option. Chose this, which brought up the Photoshop Scan window and had no problem at all scanning my photos. Even tried it in my Acrobat Professional and was able to scan PDFs (something else I'd been trying to do).
Thank goodness for Google and the internet. Problem solved, thanks to this helpful post!
(Version 5.0.1.2)