Rita, I think strong light and even or darkly coloured backgrounds help. Of course, dew drops or a mister spray can be useful to pick up the threads. I'm looking forward to the misty mornings ahead...
This was my best web (with spider) shot to date:
I'll try some more when the weather and sunlight gets more interesting.
Crabappl3 - I love the window shot. A real cobweb that one.
Medic- just think what the world would be like without spiders. We'd be knee-deep in wasps and flies - and at least spiders don't sting or spread disease. ;)