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I use the Roots Tuff Skin case. Link to a review.

Great case. Although it doesn't fit in any of my docks anymore, provides a lot of protection. Covers the sleep/wake and volume rocker, and will survive a five foot drop.
 
The Griffin Wave case is really good but the screen protector they give you sucks and it's hard to put it on with anyother screen protector on the screen.
 
Switcheasy Capsule NEO

There seem to be a few good cases out there and so it will probably come down to preference. That said, I think the Switcheasy Capsule NEO is excellent. I read quite a few reviews before I purchased it and while some people complained that it was difficult to put on, I thought it was just as easy as the Switcheasy Rebel which I have on my iTouch. I think the Capsule NEO doesn't take much from the iPhone's sleek contemporary design while doing a great job of protecting it.
 
Bought the CapsuleNEO in black about three months ago, its really a great case and awesome bang for the buck with 2 silicon pieces, 2 screen protectors, headphone and dock port inserts, the stand and the I and H frames. Mine had somewiggle...and call me what you'd like, it bothered the hell out of me. I also didn't like the raised logo on the back that made the case teeter left and right more than a naked iPhone when on a tabletop. Wiggle and teeter aside I will still recommend it to anyone interested in it.

However, I recently purchased a black Power Support Air Jacket and couldn't be happier. Easy to put on and take off, and does exactly what I wanted in a case from the start...keep the back from getting scratched. I also am astonished at how well the Anti-Glare screen protector is at keeping the screen free from fingerprints.
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If you don't want to read:

1. For scratch protection on the back and practically no bulk: Power Support Air Jacket

2. For all around protection: CapsuleNEO
 
Well, I thought the Capsule Neo was my perfect case, and then I tried the Griffin Clarifi on for size. Not only do I love the look of the case, but it protects well, and has a built in macro lens. I believe I'm 100% satisfied with the Clarifi for the moment, and it has replaced my Neo.
 
I had the Griffin Elan Form when I first got my 3G. Was great for the first couple weeks but then the plastic loosened up and I got a bunch of dust and dirt and scratches from it. I just got the Incase Slider (my original first choice, but the Elan Form was available first) and I absolutely love it. It's super snug, is smaller than the Elan Form, and looks way cooler in my opinion. My vote is for the slider.
 
CapsuleNeo will be my vote, it just protected my iPhone from liquid damage - I'm thankful I had this case on.
 
Inpsiretech

The iPhone 3G Slim Fit case from Inspiretech is the one I have. Inspiretech is usually my go-to site for basic iPhone accessories. They don't carry everything but they seem to have everything you really need for a pretty good price. Hope that helps!
 
My first case was the Rebel. It was way too bulky and i didn't like the look of it. Second was Colors. Don't like the bottom of the phone face to be covered. 3rd case White Incase Slider. Love it. After a while i was itching for something slimmer. Then came the iFrogz Luxe. It is the perfect case. It adds very little bulk yet i feel it's well protected. I'd like more colors. White and an army green.

Edit: Just want to add that the iFrogz is very easy to get on and off. I know some of the Youtube tell a different story, but really it's easy.
 
well ive had the griffin elan form leather case (black) and liked it but felt it was a tad on the "big boy" side. Then i got a bodyguardz (went thru 4 of them) and just couldnt solve the corner issues to 100% satisfaction.

Then I got a replacement phone and took the opportunity to get a gunmetal incase slider and some powersupport films. love the case but I couldnt get it to work without bubbling on at least one corner of the powersupport films (i own both versions, crystal and anti-glare)....drove me nuts. Wasted one of each because i kept taking them off and particles would get in.

Then by accident I stumbled onto a griffin iclear at target, the one that comes with some armband thing. I like it cause it has a removable clip and my anti-glare doesnt bubble (a fresh one that i put in). it was $9.50 and came with a film, armband and some microfiber (or silk) piece of cloth to clean the phone (dont know i didnt open those things). I think ive reached the end of my case searchings for now. If anything ill look for more compatible films that can work with all my cases (still have them all) without bubbling on the corners.
 
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