Apple's "Let's Talk iPhone" event is scheduled for Tue 04 Oct 2011 at 10am PDT (San Francisco) / 1pm EDT (New York). Times for other selected cities include: London at 6pm, Johannesburg at 7pm, Dubai & Moscow at 9pm, Singapore at 1am (Wed), Tokyo at 2am (Wed), and Sydney at 3am (Wed).
Links to live blogs are below. As I find more links, I'll post them here. If you have one, let me know and I'll post it.