Has anyone ever been sucessful to have the gate agent re-book you on a fellow star-alliance airline when you are voluntarly bumped?

Yes, I got bumped off a very full IAD-CDG flight in upgraded C and put onto a BMI flight in C through Stansted connecting to AF in F to CDG. Got there within 3 hours of our originally scheduled arrival time, better rested, better fed and $400 richer.

This was probably 2-3 years ago, however, and I know things are always tightening up... not to say it couldn't get done.

On LF from FRA to TLV I was offered to go on Austrian Airlines, arriving 6 hours later.

In February 06 I was booked DEN-ORD-MUC with UA returning from Vacation. Arrived at ORD there was an info message at the gate that they're looking for VDB's. Cause I've never got such a chance before, I asked the GA what do do and what's the deal behind it. I was offered either beeing rebooked on ORD-FRA-MUC with LH some hours later (but only in Y) or beeing rebooked ORD-MUC 24h later with UA in C + 4x150$ Voucher + Hotel/Dinner Voucher. Since I always fly in Y i accepted the last offer C is pretty nice compared to E+. And one day additional vacation in Chicago isn't that bad

The only mad thing at this story was that I was told to pick up my baggage at a special counter. Had to wait 5 (!!) hours while always asking/complaining about my bags. I was everytime told, yes, they'll be unloaded and I have to wait. The plane cannot start while my bags are on board. Wait, wait, wait. After 5 hours I was told, my bags are in the original plane... I'd to purchase a coat and some other small things but UA refused to be responsible for that.

But having an additional day in ORD, flying in C (with C miles earned!), getting the vouchers.....what did I want to have more?