I have a desire Z, and although I have moderately slender fingers (I have no problems with the keyboard on my nokia e71, nor did I have problems on a zaurus 860 or 3100), I often have to zoom in on a web page to accurately touch a link if there are a number in close proximity.

So I bought a stylus designed for capacitive screens (11 pence off ebay, normal price £2!). It's basically a black elastomeric conductive ball about two thirds the diameter of my little finger. It kind of helps a little bit, but not being transparent means what you gain in a reduced contact area with more accuracy you lose in direct feedback. I am glad I didn't waste a lot of money on it.

I tried a paint program, and although I'm no artist, my meagre talent was hampered by the inability to use an effective stylus.

Overall, I'd definitely rather the desire Z had a resistive touchscreen, even if only dual touch, maybe even non multitouch!

Conclusions:
1/ a dual capacitive/resistive screen would be ideal, resistive if that was the only possibility.
2/ Capacitive screens are suitable only for devices solely designed for consumption of media - no chance at using for drawing, painting, photo retouching, UI designing etc?