Bumpers

If a case is like a protective suit for your phone, you can think of Bumpers as the bikini alternative. These are molded plastic guards that wrap around the edge of the iPhone 4, giving it a modest level of protection and keeping your hands off the phone's integrated antennas.

Bumpers are available in multiple colors, and cost $29 each.
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Photo by: Apple / Caption by:
Bluetooth keyboard

The iPhone 4 supports Bluetooth connected keyboards including Apple's classy wireless Mac keyboard ($69).

We have every expectation that accessory manufacturers will be cranking out competing portable Bluetooth keyboards, in all shapes and sizes.

Also, bear in mind that if you go the wireless keyboard route, you'll probably want to invest in some kind of basic stand to keep your iPhone 4 propped up.
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Apple VGA adapter

If you're interested in using the iPhone 4 for slideshows, video output, or presentations, Apple offers a $30 VGA adapter that can connect to a projector, computer monitor, or many digital televisions. It has a maximum 1,024x768-pixel resolution output, so keep your HD expectations in check.

Composite and component video output cables are also available for purchase. All of the adapters are capable of playing video content (movies, TV shows, video podcasts, YouTube) to your television, provided the connections are compatible.
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Photo by: Donald Bell/CNET / Caption by:
Cases

If you feel as though your iPhone for needs more protection than a Bumper, several manufacturers have cases available.

The example cases show here come from iLuv, and range in price from $15-$50.
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Basic dock

Apple offers a basic iPhone 4 dock for $29 that includes an audio line output and a 30-pin pass-through connection for connecting to a charging cable, video output cable, or any other accessories that would otherwise plug into the dock connector.
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Upgrade your router

If you've been holding off on upgrading your home wireless router to the 802.11n spec (2.4GHz only), now might be the time to bite the bullet. The iPhone 4 supports the newer, faster Wi-Fi spec, so why not take advantage of it. This is especially true if you plan on making video calls using the new FaceTime feature, since the feature does not yet work via a 3G network.

Check out CNET's highest rated wireless routers for a guide on what to buy.
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Bluetooth headset

If you want the ultimate protection for your iPhone 4, why not just leave it in your pocket? By using a high-quality Bluetooth headset, you can make and take crystal clear calls on the iPhone 4 without touching the device.

Check out CNET list of Top Bluetooth headsets.
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Apple Airport Express

The Apple Airport Express Base station ($129) is a handy way to beam music around your house from any Mac or PC running iTunes.

The iPhone 4 can't stream music directly to Base station, but users can install Apple's free Remote app to use the iPhone as a wireless remote control for their home music collection.
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Headphones

Sure, you can plug any old pair of headphones into the iPhone 4's 3.5mm headphone jack, but you may as well invest in a pair with a compatible microphone and remote control.

There are tons of third-party headphones with iPhone-iPod-iPad-compatible remote and microphone functionality, but we genuinely think Apple's own In-Ear headphones sound pretty great for the price (about $70).
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Photo by: Donald Bell/CNET / Caption by:
If you're as fanatical about fitness as you are with your gadgets, the iPhone 4 offers integrated Nike+ software to track your activity. To get it working, you'll need a compatible pair of Nike shoes and the Nike+ shoe sensor ($19).
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