Had to whip up an OmniGraffle stencil for jQuery Mobile. I submitted it to Graffletopia, but it isn’t live yet. You can download it here in the meantime. Just put in the user name > Library > Application Support > OmniGraffle > Stencils folder and unzip.
Another great resource to help in your mobile web design projects is the Glyphish icon library- free and inexpensive icons for your mockups.