It's on the master list of 3.0 features, but we've been sent enough tips and suggestions about it to conclude that the advanced podcast/audiobook controls came as a pleasant surprise for lots of iPhone and iPod touch owners who upgraded.

In the 3.0 version, from the playback display for a podcast, tapping the screen brings up a set of expert controls: a button to email a link to the podcast's page on iTunes; a 30-second "What's that, now?" instant rewind button; and a playback speed control to give you 1/2 speed, normal or 2x "FedEx mode" playback.

The scrubber bar itself has been given a charge, even though it doesn't look any different until you tap it; it displays the relative playback position within the episode being played. Dragging horizontally gives you high-speed scrubbing (previously known as "just plain old scrubbing"), but if you keep your finger on the screen and drag down, your scrub rate lowers step by step through half-speed, quarter-speed and 'fine scrubbing.' This detail control makes it a lot easier to cue up a particular spot in a long show or book chapter.

I've started to enjoy listening to some of my longer subscriptions in 2x mode, especially when I have a fixed amount of time to listen to the podcast but I still want to cover as much of it as I can. Even shorter news-centric podcasts can sometimes benefit from a speed boost. If any of you try out the 2x mode on an audiobook, do let us know how it works for you.

Surprisingly, I find myself using the 'email this' button quite a lot, especially to let friends and family know about some of my favorite shows. I imagine they'll be getting tired of that pretty soon.

Way back last year, Steve Jobs mentioned that a 3G iPhone would debut some time this year. Then we started seeing iPhones being clearanced. And now, Yahoo reports that the 3G iPhone is on-track for, um, real soon now -- as early as Q3 2008 with a possible Q2 launch.

Everyone and their brother has been waiting for the 3G iPhone. So is this report reliable? AT&T declined to comment on specific launch dates. Apple declined comment. Yahoo bases its article on a report by Bank of America analyst Scott Craig. But it fits into what (a) everyone expects and (b) we already know. Is there anything new here? Possibly not. More from Apple Insider and iPod observer about possible Hon Hai 3G contracts and Kevin Rose's 3G iPhone predictions.

Does this spin & speculation make any difference to your purchasing plans for the iPhone of today -- buy now, or wait until something better comes along? Let us know.