My two cents:

波浪花兒，

首先歡迎你來美語壇。

下麵這些關於練習美語發音的視頻教材和資料，供你參考選用。

1.  美語壇網友肖莊推薦的[Daily Pronunciation series on Youtube]；

Daily Pronunciation #24 - English Lesson

https://www.youtube.com/watch?v=7ximkYyue-E

2. [Rachel's American English Pronunciation Guide on Youtube]，Rachel的示範講解係統實用，簡潔易懂；

發音示範:Word vs. World(Rachel講解)

http://bbs.wenxuecity.com/mysj/191656.html

日常美語視頻: Rachel's Summer Vacation(連讀發音講解)

http://bbs.wenxuecity.com/mysj/203040.html

3. 美語壇網友非文學青年撰寫的[十月糾音感懷]值得一讀，她在文章中寫到了糾音心曆路程，並且分享了相關的資料等。

http://bbs.wenxuecity.com/luyingzhinan/134473.html

4. 美語壇左邊的[錄音指南]欄目，網友們推薦了許多實用的練習發音的音頻材料，你可以瀏覽選用；

http://bbs.wenxuecity.com/luyingzhinan/

5. 你也可以把自己朗誦的英語文章詩歌等發到美語壇，和大家一起學習交流切磋，美語壇的[英語朗誦]欄目有網友們朗誦練習作品等；

http://bbs.wenxuecity.com/yingyulangsong/

6.美語壇的網友jennea推薦了American Accent Training by Ann Cook

http://bbs.wenxuecity.com/mysj/107457.html

http://bbs.wenxuecity.com/mysj/107455.html

American Accent Training by Ann Cook and published by Barron's provides a self study course that is sure to improve any advanced level student's pronunciation. This course includes a course book and five audio CDs. The book includes all the exercises, quiz material and reference material that are found on the audio CDs. In this way, learners follow their course by reading, listening and repeating materials that are oral in nature, but also provided in print.

7. 去當地的Community College選修專門練習語音的課程，有老師的當麵指導，同學的一起練習，也許收效更快；

8. 至於Paul Gruber's Pronunciation Workshop video，我不是很清楚。