I am always on the lookout for the perfect case, and depending on the day's events, I might swap cases once or more during the day. For example, this week I chaperoned for my daughter's Field Trip. This was no visit to a quiet, cozy museum but rather an outdoor hike and 'Stream Study', in a muddy park. And it was raining. Fortunately, I had the Kraken case from Trident ($34.95). While the Kraken is not billed as being waterproof, the case has rubber flaps that cover the various openings such as the dock connector and audio jack. The camera and front glass are covered by clear durable film as well, making it dust resistant. There are areas of extra padding which should help protect your iPhone if dropped.
I like to wear my iPhone on my belt and the Kraken comes with a rugged belt clip attached right to the case. The case did a great job protecting my iPhone during the outdoor activity so I have kept my iPhone in the case ever since. After all, everyday life can be pretty rough on a phone, too!
With some effort, the ratcheting belt clip can be removed, so if you don't want the added bulk, that's a nice option. The case comes in three parts, two of them polycarbonate and one silicone exterior. So if you do plan to remove it from the case, it's not a one-second operation, but it's also not rocket science. Finally, because the case might make it hard for your headphones to plug in, Trident bundles a 3.5mm headphone adapter that extends the port. The extra bulk means you might not be able to fit the case in a dock but you can connect it via a USB cable.
The Kraken iPhone case is a nice rugged case and now that Apple is no longer providing free cases, you might as well get one that does more than just fix the antenna issue. Trident also makes a Kraken case for the iPad. I haven't tried it but if it is anything like its little brother, it's a bargain at just $5 more ($39.95).