The sound of 애 is similar to the first vowel of Apple pronounced in American style, while 에 sounds similar to the first vowel of Error. The difference is which direction you open your mouth and lips. With 애, your mouth is opened wide vertically (upward and downward), and for 에, your mouth open wide horizontally (right and left). I hope my anwer would be helpful.

Never mind. I gurantee that 90% of korean never distingush when they speak. They know but they don't mind too.

http://www.indiana.edu/~koreanrs/hangul.html I can't even distinguish between: ㅐand ㅔ ㅒand ㅖ ㅞ , ㅙ and ㅚ (all sound like 'weh' to me :P)

Yes. ㅐ = ae ㅔ = e But don't worry ^^ koreans don't care much about ㅐ and ㅔ sounds.

ㅐ = ae ㅔ = e apple = 애플 editor= 에디터