AppleHound has posted a list of all the (supposedly) reproducible bugs they could find in iPhone 1.0. There's 68 in total, and they range from various system hangs (the Phone app will hang if you start a sync while editing a contact photo) to many different UI/Usability bugs. Some of the usability bugs are a little iffy if you ask me-- many of them, like the "bug" where photo albums with less than 20 images don't display an actual number of images, seem to be "working as intended" (because why would you need an image count when you can easily see how many images are there?), and others have already been shot down according to the Apple HIG.
But on the other hand, I can't really fault AppleHound for being such sticklers. First of all, this is a cell phone that costs $600, and you should get what you pay for-- quibbling about interface quirks now means there's a much better chance of getting them fixed in a future firmware update. And second, this is Apple we're talking about. While other cell phone companies get complaints about call reception and service outages, these are complaints about tiny, half-a-second visual inconsistencies. Heck, I love my Razr, and the screen goes nuts without reason almost daily. There's nothing wrong with holding Apple to a higher standard, and maybe if Apple is kept on their toes with the iPhone, hopefully other cell phone companies will find themselves with their feet held to the fire as well.
Thanks, Leonard Nimrod!