Troubles are back in CDO-land and the various indexes tracking credit default swaps for mortgage securities are all making fresh new lows. You can follow all the charts at Markit - here are just a few.
This one tracks residential mortgages, the tranches with BBB- ratings. Collapse is a fair description.
Things are not much better on the commercial mortgage side.
These charts are inverted because they track yield spreads, so the higher they go the worse things are. Merely for comparison purposes I have included charts for the same ratings as above.