Re: English pronunciation
Yahoo Dictionary has pronounciation guides, and in many cases, audio to help with the correct pronounciation.
Here are some:
Pollution](http://education.yahoo.com/cgi-bin/pronounce_word?word=pollution&audio=p/0418100&property=dictionary&from=/reference/dictionary/entries/81/p0418100.html)
Vacuum](http://education.yahoo.com/cgi-bin/pronounce_word?word=vacuum&audio=v/0003600&property=dictionary&from=/reference/dictionary/entries/36/v0003600.html)
Schedule](http://education.yahoo.com/cgi-bin/pronounce_word?word=schedule&audio=s/0132200&property=dictionary&from=/reference/dictionary/entries/22/s0132200.html)