Okay, I was hoping there'd be more coverage of this (I first heard it yesterday afternoon and the CBC radio announcer hopelessly confused 'Forum' and 'Colosseum' in such a way that it wasn't clear what, exactly, had collapsed). Here's the CBC's online coverage:

A stretch of wall at Rome's ancient Forum has collapsed, raising concerns that the site is no longer safe for tourists.

About 50 metres of the five-metre-high wall fell Friday morning onto a walkout that leads to the Arch of Titus and the Colosseum.

At the time, the Forum was closed and there were no tourists in the area.

It was once the centre of political, commercial and religious life in Rome.

But now it's in such a state of ruin that Italy's cultural authorities have stepped up debate over what needs to be done to safeguard what's left of both the Forum and Colosseum.

No one is allowed inside the Colosseum itself, aside from experts involved in assessing the damage. Tour groups are brought just to the fringe of the building.

The wall collapse at the Forum comes at a time Italy's parliament is debating cuts to the culture sector.

Italy's culture minister, Rocco Buttiglione, says the government will have to find funds to protect the area, which he says requires constant monitoring.

He says archeological sites in Italy need to be protected, not only because they draw visitors and generate income, but because they are "part of our soul."

All of the English coverage seems to stem from a story at MSN (the Australian version), so there isn't any clarity to be had at this point. Hopefully we'll get more details (and maybe a photo) ...