AbdulAlhazred
Legend
I think the most important advice given (and explained in a nice example) is too keep the situation constantly evolving , otherwise skill challenge become stale...
This is really the key and its been expounded on quite a bit in the Dragon article series on SCs. Just like in ANY other situation the DM has to present the situation as it exists for the characters and show them the way. When a PC acts the environment has to react and the circumstances of the challenge evolve. The tally is just the DM's way to keep track of the progress through the challenge.