Iron Man was the first big film of the summer and it seems only fitting that it be the first to reach a box-office milestone this year. According to The Hollywood Reporter, Iron Man will be the first movie of 2008 to cross the $300 million plateau at the domestic box office.

Current numbers for the film, as of Tuesday, have the Marvel Studios film sitting at $299.3 million. There hasn't been a daily gross lower than $688,000 for the film in its seven-week run so far, so the milestone will almost certainly be acheived on Thursday.

"(This) is a testament to the talented, hardworking group involved with this picture," Paramount vice chairman Rob Moore said. "Needless to say, we are all thrilled with such an amazing achievement." Marvel Studios' chairman David Maisel added that reaching this box-office mark is, "the perfect way to kick off" Marvel Studios. Iron Man was the first film fully financed and produced through Marvel Studios.

The next possible $300 million candidate is Indiana Jones and the Kingdom of the Crystal Skull, which now stands at $279.5 million domestic.