it looks like there's an iphone app
for xkcd, but for those of us without iphones, I created an xkcd mobile page.http://www.icorey.com/xkcd
it takes xkcd.com and strips everything but the images, titles, hover text, and links (first, prev, random, next last).
let me know if it doesn't work for you. one issue might be the content-type, which is application/xhtml+xml (i'm pretty sure internet explorer doesn't like this, but idk about mobile ie...is there a mobile ie?). also, let me know if you have any suggestions.
(sorry if there already is an xkcd mobile page everyone knows about. if there is, I couldn't find it.)
I also have a version that displays the last 5 comics on one page (via parsing the xkcd atom feed). if you wanna give that one a whirl, i'll put it online.