This technical help may seem completely out of place on this art blog but after scouring the internet for 3 hours trying to set my 6 year old scanner up on my new MacBook, I found this info half way down a lengthy comments section of a random blog. So I thought I'd post it here (slightly altered) as a message in a bottle to anyone else in need of it.
How to set up CanoScan LiDE 30 on Mac OSX 10.5
Select MAC OS X
LiDE 20/LiDE 30 Scanner Driver Ver. 188.8.131.52aX
(Mac OS X)
CanoScan Toolbox Ver. 184.108.40.206X
(Mac OS X)
INSTALL CanoScan Toolbox Ver. 220.127.116.11X
INSTALL LiDE 30 Scanner Driver Ver. 18.104.22.168aX . Make sure Applications>CanoScan Toolbox 4.1>Plug-Ins is selected as the install location.
You will be asked to RESTART. You should.
When you run CanoScan you can choose Photoshop as the default program to open the image in once it has scanned. You do not need Photoshop to open using Rosetta for this to work.
NOTE: If you want to scan directly from within Photoshop CS3, you need to copy the driver 'ScanGear CS 7.0X' which is found in Applications>CanoScan Toolbox 4.1>Plug-Ins into the photoshop pluggins folder, Applications> Adobe Photoshop CS3>Plug-Ins>Import/Export. You also need to open photoshop in Rosetta mode. Apple + I on the photoshop icon and select 'Open using Rosetta'. I would not recommend using this method though.
Go to System Preferences>Accounts>Login Items and remove both of the following: