Since this has been linked to as a tip to remove badges, I thought I'd throw my technique in. Regular old lighter fluid is a great adhesive solvent. A few drops on the edge of the foam where it touches the body, then use the dental floss. As it evaporates pretty fast, drip it on the edges as you work. Take your time and you will even be able to put the badge back on if you ever want to!
I use lighter fluid to remove adhesive residue from photos too.
06 Sly Sol, traded 4/21/07 for an 07 Mysterious GXP