Good list. Off the top of my head...

Billy Collins/Resto - Resto beat him with rigged gloves for 10 rounds and Collins fought they whole way through, given the circumstances thats probably one of the biggest displays of heart I've ever seen.

Ray Mercer/Wlad - Ray kept walking through a ton of heavy artillery from Wlad.

Arturo Gatti/Mayweather - 6 of the most one sided rounds you'll ever see, still wanted to continue.

Richard Hall/Roy Jones - Richard Hall took more brutal, power punches to the head than anyone I've ever seen, never even came close to winning a round and was pissed when they stopped it.