The iPhone OS 4.0 beta 2 download is now available for iPhone developers along with the new iPhone SDK 4.0 beta 2 as well. The new firmware fixes the bugs with fewer enhancements. The iPhone OS 4.0 beta 2 download comes as a 355MB .dmg file.The new iPhone OS 4.0 will include many new features including multitasking, game center, email enhancements and so much more.
Another new feature appears to be called QuickLook. This feature lets users get a sneak peek at files without actually launching the associated application. File types supported include iWork, Office Docs, RTF, PDF, images and CSV files
Via – Apple