I agree, I love Linux and used to use it full time, but I had to stop due to the lack of good audio and video editing software, I had to switch back to Windows. Also, I have never been able to compile programs from source code, thankfully I was able to find most programs on GetDeb.
I think that the easiest thing to do would be to but a link under each comic saying to click the here for a higher resolution version of the image, then have the high res version of the picture on Flickr. This will save you bandwidth and be very easy to implement. I do the same thing on my blog, http://caseytech.blogspot.com . When you click on an image in a post, you will be sent to the full sized one on Flickr. but, of course, you may not want to have your images as low quality as mine.