Although I have written a review for this camera on its own, it's main advantage is when used in connection with a remote flash so I shall elaborate here...
The Nikon D70 is a superbly well made and thought out model and at this price is an excellent way to get into pro photography. The main difference between a snappy camera shot and a professional image is the light, and the ability to light from an off camera source.
With the D70 and any speedlight from the Nikon creative lighting system such as the SB600 you can place the lighting anywhere and control the flash from the camera.
The flash is powered by 4AA batteries and will mount to the top of the D70, in this mode the camera will automatically aid focusing, asses the light needed and light according to the mode you select.
Take the flash off camera and it will still do exactly the same thing, the camera assesses the shot and tells the flash how much to give and when by a series of 'pre flashes'. All this sounds very technical but in the real world it means you can achieve stunningly lit photos without buying or carrying around loads of wires, remote senders and extras.
The D70 will control multiple speedlights at the same time so you can upgrade with more units in the future.
Regarding the SB600 itself, its a well built unit that has functioned flawlessly for me for the last year, its layout and menu is great once you know it but is confusing at first.
Control of the SB600 is taken car of with 6 buttons. Zoom, +, -, Mode, power and test. a combination of buttons held down allow you to access the menus or lock the flash mode.
When mounted to the camera hotshoe all settings are taken car of by the D70 as if using the in built flash. When used off camera or in manual mode adjustments to the brightness can be made in 1/3 or 1/2 stops and the flash head can be zoomed from a wide 24mm to an 85mm spot.
The flash head pivots through 90 degrees vertically and 180 degrees horizontally meaning its always easy to direct the flash whatever the camera angle.
My 600 is always in my bag and as soon as you power up its ready to go.
Battery life is also surprisingly good, using rechargable batteries I can normally fire over 100 shots before they need changing.
I cannot recommend this combination enough, its offers alot of creative options not seen in some more expensive models.