I had wanted to write a full iPhone 4 review, but it looks like I'm running out of time to do in a way that is both 1) timely and 2) complete.  So, I'll just aim for timely.

I absolutely love the phone.  All of the features shown in the ads are fantastic: FaceTime, Retina Display, HD video recording, etc.  Each alone is worth the price of admission, though my hands-down favorite is the Retina Display.  I can comfortably read small-type documents using the built-in PDF reader in iBooks (and just one hand, of course).  The screen just completely changes the way I think of the device.  It's a portable infinite piece of paper, connected to the Internet.  It makes the iPad almost unnecessary.  The pace of innovation is startling.

I jumped from the 3G to the 4, so some of the features that were available on the 3GS are new to me: crazy speed (especially on syncing with iMarc!), better battery life, etc. - all are greatly appreciated.  And of course I can take full advantage of iOS 4, something I couldn't do on the 3G.

The form factor is fantastic, and I'd argue it's actually improved by the bumper.  I bought the bumper before Antennagate really hit the fan, so I 1) haven't had any reception problems and 2) got a refund for my purchase.

If you're a human being who likes communication and information, you need to get this phone.

Below, a cute dog picture I took using the phone: