Update: Upgraded to iPhone iOS4 this morning, early thoughts

Upgrading my 3GS to iOS4 earlier today. Slowly trying to figure out what has changed and what hasn’t. What I know so far:

• my home screen background switch to whatever I had setup as my wallpaper
• Folders appeared – I like this feature a lot.  Nice to be able to group apps and cut down on pages
• The Mail – looks like my Gmail is now setup like my exchange account.  You can have multiple exchange accounts and calendars.  Really like this.  Still wish I could merge my contacts somehow and have them all the same.

Thats it for now, hope to have a full rundown later.

Update:  Looks like it is bringing all my contacts together from Gmail and Exchange.  Only had a couple of multiple entries when I looked at all contacts.  This is a great add.

Gizmodo has posted a Complete Guide to OS4