I just posted this in the other thread about using a task killer. Its a long read but very detailed. It is taken directly from the android devs website.
http://geekfor.me/faq/you-shouldnt-b...-with-android/
from the article:
“Buffers and cache in RAM being cleared is silly. Imagine a professor, who rather than writing all the way across the chalkboard, finishes a sentence and immediately erases and starts writing in the upper left corner AGAIN and AGAIN and AGAIN OR imagine you like a song. You record it to the beginning of a cassette tape. When you want a new song, do you re-record over the first song or record after it?”