How do I view my questions that are tagged with a certain tag? Example: All the questions that I've asked that are tagged jQuery-mobile.
Have you tried clicking the jquery-mobile tag located at the bottom of your profile page? This will list all of your posts with that tag. You can do that with any of the tags listed at the bottom of your profile page (unlike the ones listed beneath each question on your profile page, which link to the tag proper).
It's actually a short cut for a search construct,
Find out about all the cool search operators on our Search Help Page, which you can use to further refine your search with, for example,