TidBITS editor Glenn Fleishman explains in some depth at Ars Technica how so much Wi-Fi network congestion was in the air at the WWDC keynote. Based on discussions with two Wi-Fi experts, one of whom ran Apple's Mac networking hardware group for seven years, the iPhone 4 likely had a Wi-Fi driver bug, possibly triggered by the congestion. follow link
Go Back and Forth Fast in Preview
If you're reading a PDF in Apple's Preview software, and you follow a bookmark or an internal link to move around within the PDF, you can quickly return to where you were by pressing the keyboard shortcut Command-[ (that's Command-Left Bracket). Or, you can choose Go > Back.
The command works iteratively, so you can go back to just the previously viewed page or if you issue the command again, to the page before that, and so on. There's also an equivalent Go > Forward (Command-]).
- ExtraBITS for 14 June 2010 (14 Jun 10)
Congested Wi-Fi WWDC Keynote May Have Triggered iPhone 4 Bug