Interesting discussion, and a subject close to my heart ;-) As already suggested by Paul, in absolute terms a conventional SLR with a good quality macro lens is technically still able to deliver you with superior results where it concerns raw resolution, even if the most recent batch of pro-level/pro-price digital SLRs now have caught up with top quality 35mm slide resolution.
However, in the 'real world' shooting of flies the advantages which a consumer level digital point&shoot (provided you select a brand/model offering the right combination of features and glass quality) will give you well outstrips the theoretical edge a traditional SLR/macro lens combo would appear to have. I used to shoot 'traditional', moved to digitally shot images of flies some three years back, and never looked back since! Cheers, Hans http://www.danica.com/flytier
