1.http://www.youtube.com/watch?v=N8uaHe5FrPc
2.http://www.youtube.com/watch?v=FxUuAlcnhjc&feature=related
3.http://www.youtube.com/watch?v=cLVCyyXKVGA&NR=1
4.http://www.youtube.com/watch?v=7Gzl9x1Vqbg&feature=related
5.http://www.youtube.com/watch?v=A7bKKwn5-t4&feature=related
6.http://www.youtube.com/watch?v=E_4VzhuNQuk&feature=related
7.http://www.youtube.com/watch?v=iDEVgIavMG4&feature=related
8.http://www.youtube.com/watch?v=1ioMKDVXNkM&feature=related
9.http://www.youtube.com/watch?v=l2QsfrN2oII&feature=related
10.http://www.youtube.com/watch?v=1PPy-orZJK0&feature=related
11.http://www.youtube.com/watch?v=WtQO0ZaB8yk&feature=related
12.http://www.youtube.com/watch?v=avcKM0Hz_sE&feature=related
13.http://www.youtube.com/watch?v=wi6HBR4ifJQ
14.http://www.youtube.com/watch?v=7zbWjNKST8w&feature=related
15.http://www.youtube.com/watch?v=uTM8c4-8poA&feature=related
http://b4worker.blogspot.com/2010/07/powerpoint.html