Warning: Spoilers
The fan site Freeze Dried Movies claims it knows that Topher Grace will play Venom and Thomas Haden Church will be the Sandman in the upcoming Spider-Man 3 movie.
Here's an excerpt: "FDM has learned that Topher Grace of That 70s Show will play the immortal VENOM in Sam Raimi's third Spiderman adaptation. We told you guys a few months back that 'someone' has snagged the rights to the character of Venom off of New Line Cinema and it was reported a few days ago that Grace had been 'bulking up'- so we decided it was time to put the pressure on. So there you have it VENOM! Now as for the other two stars listed above we've been told that Thomas Haden Church will in fact play SANDMAN and that James Franco will play HOBGOBLIN and not the Green Goblin II (like in the comics). No more info can be given at this time, but I've confirmed this with various sources and apparently it's quite well known."
We'll see. There’s still a long ways to go until the movie debuts May 4, 2007.