Hi JRLA
I fish spiders in all sorts of ways, depending on what i am trying to achieve, mostly this is upstream in a pair as you would a single dry fly.
Although if i need to drift them downstream then i will do that too. It really depend on where i am standing, where i think i can reach successfully and where the trout are showing themselves or likely to be holding. I could not give you any precise way to do it, if it catches fish then it works
If you practice some of the river style casts like curves, reaches, puddles etc then you can introduce line to the water to help avoid drag. The Carl McNeil and Massimo Magliocco DVD's are a good source of how to do these along with many other useful techniques, if you cannot find good references online.
I think Olly Edwards technique is called the escalator, it is one of many he employs and is a good search technique, again it is just a casting style to help avoid the dreaded Drag.
Its worth learning a few different casts to add to your repetoire.
As for czech style nymphing this involves no casting, it is basically like freelining a worm but using a fly rod, very effective in the right bits of water, but you loose quite a few flies and its a lot of work searching like this, fun for an hour but not all day
Lots of interesting stuff online, probably one of the easier methods to experiment with, only tip i have, is start from the bank and work your way into the river only after you have explored everything within reach
Cheers
Sandy