Thanks to fellow cartoonist and all-around awesome guy Tyler Martin, I've just added a bunch of RSS feed subscription options (scroll down, left-hand side).
Provided I set them up correctly, you should be able to add the Sheldon toon-and-blog feed to your favorite aggregator with one lil' click. Buuuuut...you and I both know that among all those tidbits of code, I probably made a typo somewhere. So if you're willing, please test out your preferred subscription option...and let me know if it's not working.
And on a related sidenote: if anyone knows of a simple way folks can add the Sheldon feed to their MySpace or Facebook page, let me know! I'd love to give folks that option, if it could be made to work.