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Email has been improved with previous HTML redding capability, but now HTML email creation. Crucially, you can indent text but add emphasis on words -- such as bold, italics or underline text -- simply by selecting it. Because iCloud is heavily integrated, you can set up an iCloud email account as well as the other email accounts, from Exchange to IMAP or HTTP web email.
Under the 'PC-free' ethos that iOS 5 seems to have, users can now delete, add and rename calendars directly from an iOS 5 device; previously requiring a iTunes connection to do this. Attachments are also accessible through the calendar without the need to switch applications, and of course -- iCloud integration, so all your calendars synchronise across devices.
Following on from the 'PC-free' ethos, iPod touches, iPads and iPhones running iOS 5 no longer need a PC or a Mac to perform software updates or synchronise their iTunes. All they need is a Wi-Fi connection and users can update or synchronise their iTunes and operating system wirelessly.