Do you have a Canon LiDE 30 without drivers for OS X Leopard? What about Vista?
Yeah, I thought so.
I've had a very nice, very functional LiDE 30 for a few years now and after upgrading to Leopard, it either worked poorly or not at all. So, I Googled for a solution and found VueScan from Hamrick Software.
It's pathetic when you consider that ginormous corporations can't upgrade their drivers and software to work properly with OS upgrades, yet lil' ol' Hamrick can support 1200 of them. Yes, you read that right. This five megabyte download has support for more than 1200 flatbed and film scanners, multi-language support and a full-fledged scanning environment - no Photoshop or other image editing software needed in order to acquire your scanned image.
If you've ever purchased a version of VueScan in the past, there's good news for you: in celebration of their 10th anniversary, anyone who has ever purchased any version of VueScan can upgrade to version 8.5 for free.
Either way, consider yourself lucky to get your old doorstop of a scanner working again.