Thanks. I think that's a good way of describing it, everything feels quite well thought out once you get used to it. The main learning curve is likely to be if he uses any sort of social networking, because the phone has an all-encompassing "people list" rather than separate places for your phonebook, Facebook friends, etc. But once you get all the information in, it's a nice way of keeping all of your means of contacting people unified, as well as being able to create groups (I have two at the moment, family and university mates, for example) then pin those groups to the home screen for easy access. The fact that there's only two pages for the home screen, the main page and the applications page, also simplifies things and makes it easier to stay organised. It's definitely an easy OS to pick up from what I can tell.
Another discovery: Mango has the best virtualised keyboard of any Mobile OS I've used, hands down.
Not exactly sure what you'd want pictures of, so I've just taken a couple of quick ones. Let me know if there's anything else you'd like to see [= Again, excuse the poor camera quality, lighting is pretty terrible here and there's issues with my iPhone's camera XD
The lock screen. Lots of information there for quick glances, including how many messages and emails you have (I assume voicemail and missed calls will also show up). Music info and songs as standard, no album artwork like iOS gives you but I'm not really all that bothered.
The password input slides up as you slide to unlock, which is a nice little feature (I don't know how android does it, but with iOS you used to have to slide to unlock then wait to the keys to come up afterwards).
The home screen. As I said before, customisation options are very far and few between, consisting entirely of which tiles you use, what colour you'd like them to be (From a choice of only 11 colours) and whether you'd like a white or black "theme" (The obvious change is the background, although I think it recolours other things like the keyboard). Again, not a problem if you like the interface, and there are apps in the app store claiming they can create custom tiles which you can assign functions to, but anyone who likes to tweak their android devices to their heart's content will end up pulling their hair out. On a final note, the blank space is where my girlfriend's tile lives. I've deleted it because I don't think she's want me showing off her mug to anonymous strangers, but I can confirm that individual people's tiles actively update with any profile changes they make or whether you have new texts/calls/emails from them, which is nice.
Using either button on the volume rocker drops down the music and the mute controls, which is handy because I've discovered another minor gripe- the Nokia Music app sits on a screen displaying the Nokia logo for 2 or 3 seconds before taking you into the app (If you choose it from the home screen/app list, it can be avoided by accessing the app through multitasking). I highly doubt this is a loading screen because it has no problems bringing everything else straight up and a music player's hardly the most demanding of processes, so hopefully they'll cut out the shameless plug of their brand in a future update.
Aaand finally the back of the device, just in case you haven't seen it XD I haven't had a chance to test out the camera yet, it's a relatively sunny day though so I'll get some pics on my way up to lectures and some low-light ones at the poker tournament I'm playing in tonight. I've heard mixed reviews so far, which I'm sincerely hoping are being overblown just as the sharp corners were.