It's definitely an option to consider. Apple's warranties on portable devices is worldwide, so you can use your own country's Apple Stores or other services if you have any issues. Regarding the import process itself, be aware of taxes and import duty for your country. If you're in the UK, you won't need to pay any import duty as long as you make sure the package is appropriately marked (you probably want it to be marked "laptop", which carries no duty, is accurate for the purposes of Customs and is easy for them to understand). In the EU as a whole, you will of course pay VAT on top of the combined purchase and shipping price.

Your iPad will work just fine, wherever you are. Certain apps (like the iWork apps) won't be visible in your local App Store until iPad is officially released in your country, but they're a minority - and you can always buy them on your Mac or PC with a US iTunes account if you have one, then sync them to the iPad. Same applies to the App Store on the device (it'll only work if you're signed into a US account), and to the iBooks Store (is currently US-only) - but those will all start working fine as soon as iPad is officially available where you are and/or when the iBooks Store becomes available in your country.

iPad comes with a standard Apple design of power brick: the actual transformer itself in a little white cuboid, and a detachable country-specific plug (a US one in this case). You do need to use the power brick included with iPad (it needs more power than an iPhone or such to charge), but you can plug any country-specific plug section into it and it'll work just fine; I use my iPhone's UK plug-adapter (rated 2.5A) with the iPad's power brick. You can also charge it via USB to your Mac, though that'll be a lot slower.

Generally you won't have any issues at all; it's the same iPad regardless of where you get it. If the cost to benefit ratio of importing it works out for you, by all means go for it; there's no downside that I've found.