Thanks Angelmb, the link you provided helped. It took me a while to figure out that I was supposed to use the "photo gathering" app in OSX. I had expected the driver to come with its own separate app like it was on the PowerMac.
Strangely enough, when I searched for a driver through Epson's Swedish support site I found a driver download that was clearly listed as being for both Power Mac and Intel Mac, but it was actually only for the Power Mac. Called their phone support and they could not solve the problem. They claimed that there was no way to use this scanner with an Intel Mac. So much for phone support...
The website you directed me to also advises me to download a "Config utility" which I couldn't find. But it does not seem to be needed. The Photo gathering worked.