SBCL version 1.0.11 has been released.

sbcl-1.0.11 sources are in CVS and on the SourceForge File Releases
page now; enjoy.

from the NEWS file in the distribution:
changes in sbcl-1.0.11 relative to sbcl-1.0.10:
  * incompatible change: hash-table accessor functions are no longer
    automatically protected by locks. Concurrent accesses on the same hash-table
    from multiple threads can give inconsistent results or even corrupt the
    hash-table completely. Multi-threaded applications should do their own
    locking at the correct granularity. In the current implementation it is
    still safe to have multiple readers access the same table, but it's not
    guaranteed that this property will be maintained in future releases.
  * minor incompatible change: (SETF MUTEX-VALUE) is not longer supported,
    and will signal an error at runtime.
  * enhancement: SB-THREAD package now exports a semaphore interface.
  * enhancement: CONS can now stack-allocate on x86 and
    x86-64. (Earlier LIST and LIST* supported stack-allocation, but
    CONS did not.)
  * enhancement: nested lists can now be stack allocated on
    platforms providing stack allocation support.
  * enhancement: dynamic-extent support has been extended to support
    cases where there are multiple possible sources for the stack
    allocated value.
  * optimization: RELEASE-MUTEX no longer needs to perform a syscall
    if the mutex is uncontested on Linux.
  * bug fix: symbol-macro expansion now uses the *MACROEXPAND-HOOK*
    as specified by the CLHS. (thanks to Tobias Rittweiler)
  * bug fix: NaN comparison now works on x86-64.
  * bug fix: CLOSE :ABORT T on a stream with pending output now
    works.