I want to take off the 240sx and the se emblems on the back of my car.  I heard that it is double sided tape is that true?  And what do i use to take them off and how.

Dental floss between the emblum and the body. Just work it back and forth till you have it all the way through. Then use some "goo-gone" tar remover to get off the residue.

Either do it on a hot day, or use a hair dryer to heat it up a bit.  Everything else, uuninja said is correct.

Anyone else think that this should go in FAQ?  It's asked an aweful lot.

it's actually pretty darn easy.

1) clean the area around it (just do it 'cause it's fun)
2) take heat gun and warm the glue up
3) dental floss it, or peel it off
4) left over glue? use maguire's step 1 cleaner, it'll clean it out easy, just takes patience

You can take off the nissan emblem on the back using dental floss too correct?

No, the Nissan emblem in the back is the only thing that you cannot take off using dental floss.  It is not simply glued on.

Remember the emblems are plastic...if you use a heatgun and aren't careful you can melt them <img src="#/f/iB_html/non-cgi/emoticons/lookaround.gif" border="0" valign="absmiddle" alt=':look:'> if you see smoke comming up...it's too hot. &nbsp;Thats what I get for using my heatgun on 1000degrees <img src="#/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>

But ya, i took mine off the other day, just geat it up and wiggle dental floss back and forth behind it and it'll slide through like butter.