@Michael: I bet a sticker would fit fine on those mugs. The stickers are only 1 inch tall, so they're pretty good at dealing with a small amount of curvature. If you do decide to make an MO mug this way, it's a good idea to put some clear packing tape over it so you can wash it without worrying about the sticker.
@cmcleman, VP: If you want, I can sign up for some third-party website that produces swag, like cafepress or zazzle, but their stuff isn't cheap ... I don't think I'd pay $25 for a t-shirt. As for stickers, you're welcome to send me* a self-addressed stamped envelope and I'll send you half a dozen stickers (or more if you really want). You can also make the stickers yourself the same way I do: find a color printer, some sticker paper, a paper cutter, and print this pdf.
* you can use this mailing address:
Anton Geraschenko
2610 Regent St. Apt. 106
Berkeley, CA 94704
Edit: MO zazzle store at http://www.zazzle.com/mathoverflow*. 10% of the price gets credited to my account (more if you include the star in the preceding URL). If this credit ever exceeds $25, they'll send me a check which I'll use to cover the costs of domain registration ($30/yr), Scott's hosting costs for meta/MathJax ($?/mo), and making stickers ($20/400 stickers?).
]]>@Michael, what shape are your mugs?
]]>I would probably buy a mug. (Or put a sticker on an existing mug, but my existing mugs are oddly shaped so a sticker probably wouldn't work.)
]]>Note that MO stickers are extremely versatile. Put an MO sticker on a mug: BAM! MO mug. MO sticker on your ears: BAM! MO earrings. MO sticker on the dead mouse outside your door: BAM! MO mouse mat.
]]>MO top hats.
]]>You can also make your own MO stuff if you want.
]]>Do you have any more? I want one.
]]>