"Heroes":
Smiley Smile album version
Hawthorne stereo mix
Humble Harv demo (edit)
Humbe Harv demo (full version from TSS)
"Cantina" version (released on everything ever)
TSS edit (mono)
TSS edit (stereo)
Live version, Concert twofer bonus track from '67
Live version, In Concert album
And then several "sections" edits, both in stereo and mono. I'd say it has "Vege-Tables" beaten.
"Good Vibrations" may give it a run for its money, though. Not sure.
H&V - there's another live version on Endless Harmony. Also, are we talking strictly BB or solo aswell? If we are you can add on the BWPS versions of Vega-tables & H&V. Oh, and H&V live on Al's LILV.