I'm still looking for a camera phone that I can use under Linux for wireless internet access without any extra funky hardware or software. I've been eyeing the Sanyo SCP-8100 for an option, as my SCP-4900 works extremely well for this. However, I've held back because I can't find much report of anyone successfully using an 8100 with Linux.
Until today. I found two examples of people supposedly getting an 8100 working as a usb acm modem with Linux. Checkout Lukewarm's SCP-8100 page and Frank E. Harrell's Linux Setup Notes for two examples.
I'm glad to say that the Sanyo-SCP 8100 is 100% supported under Linux. I spoke with Frank Harrell directly (link above) and he confirmed its operation with Knoppix. Now I just have to get one.