Road Cycling - Is this indicitive of Italian threaded BB????

So I went out for a short ride today and I noticed that my front derailleur wasn't taking the chain to the big chainring. I thought the cable was slack and went ahead to re-adjust it. But that didn't help. It wasn't until I was almost finished my ride that I noticed a grinding/rubbing. So I stopped riding and took a look once more at my mechanical poblems. To my surprise, the bottom bracket was unthreading on the drivetrain side, causing the crank arm on the other side to rub against the bottom bracket shell of the frame! Well, that was the end of my ride and I had to take a cab home. I know that this sort of stuff happens from time to time but I wonder what can be done to prevent this from happening again.

I'll be taking the bike to the LBS to have them fix this, but I am worried that the rubbing caused permanent damage to the frame and/or the crank arm. Here are some pics...comments welcome.

http://members.shaw.ca/nemod/bb01.jpg

Mmmm....notice the aluminum shavings between the crank arm and the frame...

http://members.shaw.ca/nemod/bb02.jpg

Here's a couple of threads from a short while ago:

http://www.bikeforums.net/showthread.php?t=56411&highlight=italian
http://www.bikeforums.net/showthread.php?t=14652&highlight=italian

I'd be getting the left crank checked out too.

What sort of bottom bracket is it?

Were you riding hard with the bracket like this? If so, you should check the thread in the frame.

I recently had an Italian BB frame for only a few weeks without any problems (I didn't really like the frame, so I've taken the bike to bits), and I was aware of the potential problem with right-hand threads, so I did it up super tight, marked it with some paint so I would notice any movement, and REALLY HAMMERED the bike.
I checked it every day for the three weeks, and it didn't move.

Apparently it was much more of a problem years ago with non-cartridge bottom brackets because the bearings, rotating the way they do, were in direct contact with the cup that was screwed into the frame.

Here's a quote from another post by John E: "cartridge bearings should ameliorate the situation by eliminating the direct epicyclic action of the ball bearings against the cup."

Thanks 531Aussie for the thread links.
The bottom bracket is a 2004 Chorus and I was riding fairly hard when I noticed the unthreading.
Oh, I hope the threads in the frame are not damaged :(
I'm going to take it in to the LBS.

I put 15k mi on my Cinelli with a Record Italian BB and never had an issue. This seems to be installation issue more than a BB issue.

It's probably mentioned on the other threads, but apparently there's some controversy regarding whether or not the cups should be greased before installation.