Interesting point that actually...the most we will blow a pic up is A4 (grandad daughter on the way) is 6 mp pushing our luck a bit
See enlargement sizes here.
http://www.cambridgeincolour.com/tutorials/digital-camera-pixel.htm
Here is a good web site ...
Compare my 'digicam' with the Nikon
Click here
compare images :-
My cam, Olympus C-5050 digicam 5 MP (2003) ..
Olympus C-5050Z Review Samples (16 of 17), 21 mm, ISO 64, 1/100 sec, F2.6, +0.0 EV
http://dpreview-img.fotki.com/gallery/olympusc5050z_samples1/030109-1342-18.jpg
Now see
Nikon D40X Review Samples (19 of 32), 180 mm equiv, ISO 100, 1/100 sec, F4.8, +0.0 EV, 55-200 mm DX VR
http://dpreview-img.fotki.com/gallery/nikond40x_samples/dsc_0309.jpg
Notice size difference ... Also notice the digicam picture was taken with it's lens as bought, but the Nikon picture utilised a 55-200 mm lens, not part of the usual package - The lens weighs 340gms !! costs RRP £249 !! (£150'ish)
Could buy body only, (my route) then buy a suitable lens separately, expect total weight near to 1Kg -- The digicam near 480 gms
Just like washing machines having umpteen extra adjustments on board, we generally need very few ... That is why my Olympus OM1 SLR remains in perfect working order after 27 years !! Just one tiny long lasting battery for the light metering system. That SLR allows the adjustments necessary to produce technicaly good shots - artist it isn't... therefore matches its owner