Dear ghost,
I am not a flash person, so I'll let someone else comment on that, but the lens part is very close to my heart so I'll have to chip in my 2 cents here.
You can mount an AI or AIS manual lens on the D70 and take a picture. This essentially allows you to use lenses that were made from the late 70s up to today. No, there is no metering. Yes, you can select the shutter speed on the camera body and the aperture on the lens and take a picture.
But no metering how? I thought this was a big problem until I got to play with leonzhu's D100. I mounted a manual lens (55mm f2.8 micro) on his D100, aga-aga and set the shutter speed and aperture, take a shot and voila, my "agatation" was quite good and the LCD gave instant feedback on my exposure condition. The histogram was a great help. If the exposure is over or under, I just adjust and do a reshoot until I got it right.
Trust me, the process is very intuitive and is faster than you can read this paragraph. You essentially have a built-in "polaroid" camera that can give you instant feed back and the tests are free! You don't even need an exposure meter! This occasion absolutely convinced me to "go digital" because I love my manual lenses and I have resisted all this while because I thought, like you, the D70 (D100 for me at that time) cannot use manual lenses. Yes, it works and it works beautifully. :thumbsup:
OK, anybody want to talk about the flash part?