I also think that extensive repetition and immitation are good strategies for developing pronunciation skills. The problem is that we have little classroom time to do it and the mojaorty if students don't take it seriously. But we should do it regularly.Added (07.10.2010, 10:06)
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I recommend practising pronunciation at differetn lesson stages. Pronunciation drills should not be only at the start of the lesson. besides, wehn you teach pronunciation, include new class activities. A very simple one is walking and pronouncing rhymes or workds or sounds, immitating or dramatizing. If you do regularly, you students will imporve their pronunciation in five lessons.