Seems Steve Jobs is making the rounds at conferences... he is scheduled to give the Keynote speech on Tuesday, August 29, at the Seybold San Francisco publishing conference. According to MacWeek:
"There was no word on the topics he will cover, but Jobs has used past Seybold keynotes to announce new Apple products. Last year, Apple introduced the Power Mac G4 and Apple Cinema Display at Seybold. "
If nothing happens at MacWorld, then Seybold offers Jobs another opportunity to surprise us.