In reply to Chris Craggs:
Your welcome, rambling about cameras isn't exactly a chore.
Re the primes.
Nikon's traditional AF system was essentially a screwdriver added to a hole in the lens mount driven by a motor in the camera body, not exactly speedy but allowed Nikon to keep using the same lens mount, so lenses going back 40 years or so will mount to any Nikon body (there are a few honourable exceptions). A faster system was devised whereby the motor gets put in the lens itself, making the motor in the body redundant (these lenses are designated AF-S). (Canon just binned its old mount design and hoped everyone would buy a new set of lenses to gain the benefit of fast AF, which they did.)
With the introduction of the D40 Nikon dropped the motor, which made the camera smaller and lighter but of course the D40 (and the D40x and the D60) won't AF with any none AF-S lenses. For most people this isn't a major problem because nikon does have a reasonably compressive catalogue of AF-S lens. The gap in the line up is a lack of AF-S standard primes. Nikon will probably bring out AF-S versions of these lenses but when is anyone's guess.
Given that AF standard primes won't AF with the D40, the thousands of v sexy MF primes out there become more attractive. However the D40 will only meter with lenses that have a microchip inside them to identify the lens to the camera. Nikon lenses have physical lugs that identify them to the camera but the D40 does have the bits to read this. Posh £1,000+ cameras like the D300 allow you to tell the camera via the menu system what lens you've just stuck on the front and this will give you all the metering modes including matrix metering (but not "3d colour matrix metering") which probably doesn't make much of a difference in the real world, but the D40 being the feature stripped entry level model doesn't have this option.
So for a D40 you can have an AF lens that won't AF but will meter or an MF lens that won't do either (but is otherwise lovely)?
Does this matter?
Yes and no. I use an 50mm MF prime with my D40 a few test shots to get the exposure right, looking at the image and histogram and I'm away.
http://www.flickr.com/photos/jswood/
Last 8 or so shots are taken with my MF prime.
MF isn't particually easy in low light and you don't have a split screen to assist in focusing (although you can get one of those fitted if you're that keen and the viewfinder is apparently not as bright as old film SLR's (I can't confirm that yet - that's my next ebay purchase). I can still usually get an image in the same time or less using an none metering MF prime with a DSLR than with a compact camera.
(N.b. Nikon did produce one prime lens a 45mm(p) f.2.8 "pancake lens" that has the chip to talk to the camera but it isn't made anymore and will cost you about £240 on ebay. Richard Carter's got one and likes it. CF the cost of a MF 50mm 1.8 which will set you back £40 on ebay.)
Oh btw, don't put too much weight on what i say, I've been into this for about 5 minutes!