Tempted to revert back to an older php version to see what happens based on faulting module php5ts.dll, but may not be related
From the Apache error log
zend_mm_heap corrupted
[Thu Aug 26 14:27:33 2010] [notice] Parent: child process exited with status 1 -- Restarting.
[Thu Aug 26 14:27:34 2010] [notice] Apache/2.2.11 (Win32) PHP/5.3.0 configured -- resuming normal operations
[Thu Aug 26 14:27:34 2010] [notice] Server built: Dec 10 2008 00:10:06
[Thu Aug 26 14:27:34 2010] [notice] Parent: Created child process 5140
[Thu Aug 26 14:27:34 2010] [notice] Child 5140: Child process is running
[Thu Aug 26 14:27:34 2010] [notice] Child 5140: Acquired the start mutex.
[Thu Aug 26 14:27:34 2010] [notice] Child 5140: Starting 64 worker threads.
Additional errors (not sure if these are related to zend_mm_heap corrupted)
[Thu Aug 26 14:10:14 2010] [warn] (OS 64)The specified network name is no longer available. : winnt_accept: Asynchronous AcceptEx failed.
From Windows Application Error Log
Faulting application httpd.exe, version 2.2.11.0, faulting module php5ts.dll, version 5.3.0.0, fault address 0x0000c309.