How do you pronounce...

[Orominuialwen]

Shouldn't the 'd' in Galadriel be pronounced with a slight 'th' sound and not with a hard 'd'? Like /ga-LATH-ri-yel/ ? Just asking. Because Christopher Tolkien says it's /METH-ros/ for Maedhros...

No, it shouldn't be, because there is no 'h'. 'dh' should be pronounced, according to Appendix E, like

the voiced (soft) th of English these clothes

Also, Eärendil should be pronounced like Ay-AH-ren-deal, according to Ardalambion, which tends to be highly reliable. Cate Blanchet totally mutilates this in the movie.

Personally, I am very annoyed over the pronunciation of Sméagol in the movies as SMEE-gull. Éomer and Éowyn are pronounced like AY-oh-mer and AY-oh-win, which I agree with, so by the same logic, Sméagol should be pronounced like SMAY-uh-goll ("goll" rhyming with "doll"). Anyway, since I am not an expert on this by any means, please visit Ardalambion and download their excellent Quenya lessons, which have a good pronounciation guide. Also Fellowship of the Word-smiths is quite helpful for linguistic questions.