D40:
http://www.dpreview.com/reviews/NikonD40/
Key features
6 megapixel DX format CCD (1.5x FOV crop, as D50)
Nikon Image processing engine (as D80 / D200)
3D Color Matrix Metering II, 420 pixel sensor (as D80 / D50)
New Multi-CAM530 three area AF sensor
ISO sensitivity range 200 - 1600 plus HI 1 (3200 equiv.)
Custom Auto ISO (selectable maximum ISO, minimum shutter speed)
2.5 fps continuous shooting (as D50), unlimited in JPEG
No status LCD, new LCD monitor based status / settings screens
Help suggestions on LCD monitor (eg. scene too dark, try using flash)
Large 2.5" 230,000 pixel LCD monitor
Bigger viewfinder view (x0.8 magnification, 95% coverage)
Short shutter lag and viewfinder blackout
Support for SDHC (SD cards over 2 GB in capacity)
In-camera retouching
D-Lighting (shadow / highlight enhancement)
Red-eye reduction
Trimming
Monochrome
Filter effects
Small picture
Image overlay
USB 2.0 with PTP and Mass Storage device support
Very compact, light body (smaller, lighter than D50)
Improved menu user interface (as D80 / D200)
New EN-EL9 Lithium-Ion battery (7.2V, 1000 mAh)
New 'Version II' AF-S DX 18-55 mm kit lens
D60:
http://www.dpreview.com/reviews/nikonD60/
Nikon D60 key features
10 megapixel DX format CCD (1.5x FOV crop)
Nikon EXPEED processing 'concept' (as per D300, D3)
3D Color Matrix Metering II, 420 pixel sensor
Multi-CAM530 three area AF sensor
New Image sensor cleaning system
Eye sensor (turns off LCD display)
ISO sensitivity range 100 - 1600 plus HI 1 (3200 equiv.)
3.0 fps continuous shooting*, unlimited in JPEG
No status LCD, LCD monitor based status / settings screens (now rotates)
Help suggestions on LCD monitor (eg. scene too dark, try using flash)
Large 2.5" 230,000 pixel LCD monitor
Short shutter lag and viewfinder blackout
Support for SDHC (SD cards over 2 GB in capacity)
In-camera retouching
Quick Retouch
D-Lighting (shadow / highlight enhancement)
Red-eye reduction
Trimming
Monochrome
Filter effects
Small picture
Image overlay
Raw processing
Stop-motion movie
USB 2.0 with PTP and Mass Storage device support
Very compact, light body
Improved menu user interface
EN-EL9 Lithium-Ion battery (7.2V, 1000 mAh)
New stabilized AF-S DX 18-55 mm kit lens
D50:
http://www.dpreview.com/reviews/NikonD50/
you wont really find the D50 anymore since its discontinued....
if you click on compare it will show the specs side-by-side. overall the D60 is just an overgrown version of the D40, it has higher MP's (doesnt really matter unless you think youll need it), its slightly faster (frames/ second).
Lucky7: I wasnt saying that anything in this discussion is professional, dont exaggerate the point. like i said and you just verified, entry level cameras dont costs $900 anymore. you can get a rebel XTi/XS (and the like) for ~$400 now BRAND NEW.