(Theo Wikipedia)
The updates that have been released are:
**1.0.1 - July 31, 2007 **
- Safari security update
**1.0.2 - August 21, 2007 **
- Fixed bugs
**1.1.1 - September 27, 2007 **
- This update is commonly called the iPhone “September '07” update by Apple [76]
- iTunes Wi-Fi Music Store
- Louder speakerphone and receiver volume
- Home button double-click shortcut to phone favorites or music controls
- Spacebar double-tap shortcut to intelligently insert period and space (eg: ". ")
- Mail attachments are viewable in portrait and landscape modes
- Stocks and cities in Stocks and Weather can be reordered
- Apple Inc. Bluetooth Headset battery status in the Status Bar
- Support for TV out
- Preferences to turn off EDGE/GPRS when roaming internationally
- New Passcode lock time intervals
- Adjustable alert volume
**1.1.2 - November 12, 2007 **
- Battery charge level shown in iTunes
- International language & keyboard support
- Patched the TIFF exploit
- Adds custom ringtone field
- Fixed bugs
**1.1.3 - January 15, 2008 **
- This update is commonly called the iPhone “January '08 Update” by Apple [77]
- Google Maps gains the ‘Locate Me’ feature which determines the phone’s approximate location using cell tower triangulation and (in the US and Canada) Wi-Fi data from Skyhook Wireless; also adds hybrid map support and the ‘Drop Pin’ feature.
- Icons on the homescreen can be rearranged and placed on multiple homescreens (up to nine).
- iTunes gift cards can be redeemed on the iTunes Wi-Fi store.
- Movies acquired through iTunes have chapter support.
- Music has lyrics-support feature
- Web Clips can be added to (and subsequently removed from) the homescreen.
- SMS messages can be sent to multiple contacts.
- SMS storage capacity increased to 75,000 (from 1,000)
- Default Gmail IMAP setup for new accounts (previously was defaulted as POP3).
- Multi-touch keyboard (ie: simultaneously pressing “Shift” + “a”)
- The clock timer now remembers the last used options. (bug fix)
- Incoming SMS messages now prompts the user to “View” or “Close” (previously “Ignore” or “Reply”). Pressing either option now marks the message as “seen” so there is no way to defer messages anymore.
- Labels for contact data can now be deleted.
- Applications on the phone no longer run as root; they run as the user “mobile” instead.