I have learned that carting around a little Dell Mini 9" NetBook is really quite handy. Sure, it is not a very powerful thing and is, well, slow. But. It does have a 9" screen (which is bigger than the LCD), has a built in SD slot (meaning it is easy to move pictures from the card to elsewhere...in the field even, which is way nice), is very, very light, and can even be used to tether, again in the field. For little operations like copying/tagging files and seeing what you have on the spot, well, it is hard to beat that form factor. It certainly fills the little niche that I wanted it to. It will run about anything you ask it to, but big programs are just painful.
Does it replace my normal MacBook Pro? Nope. Not even close. But the little one fits easily into the camera bag, goes where I go, and is handy. And sometimes, I even use it as a computer to browse the web, too
In you do turn your NetBook into a Hackintosh, beware that although it is easy to do, you have to worry about updates from Apple breaking it. So, there is some maintenance you have to always do in that you have to stay atop of the updates, and sometimes apply patches or do little reinstalls. If you do go this route, I would encourage you to NOT make it mission critical. In other words, don't store your one of a kind priceless photos on it, and don't put anything on it that you can't part with should the worse come to worse--as happens in this little world. Would I do it anyway?
yup!
If you really want a Mac in a nice form factor, consider the Air. Don't like the regular retail price? (I don't...) Then you can go the online Apple store and get a refurbished one for a whole lot less than regular retail, including the standard warranty. This will give you the stability and darn near the form factor you might be seeking. As of this writing, there is one for $999. About $500 more than a NetBook, and about $400 less than a new one. So, this might be an option for you. If you don't see one, just keep looking every now and then. The refurb store moves items in and out rather quickly and sometimes a page refresh is enough to find it.