Jill is on the Bitten By Books website tomorrow (2010 March 3), participating in a Tesseracts Thirteen on-line Question and Answer session from noon to midnight (with some breaks).
If you RSVP to the event, you will get 25 entries to their contest (details on their website), but you have to let them know that you RSVP'ed when you submit your question.
Note -- As of approximately 11:30am today, a little over 24 hours before the scheduled start of the event, the Bitten By Books server seems to be intermittently down (or at least unavailable) no doubt due to hordes of fans rushing to sign up for the opportunity to ask Jill questions :-)
UPDATED on 2009 March 4, 1:45pm -- it turns out that the online Q&A ran from noon yesterday to midnight tonight, not last night. Still more than 10 hours to go, and Jill has even contributed a prize to the contest.