powersaved crashes for me, after a bit of acpi activity.  Usually the way I notice is after plugging/unplugging my laptop and the CPU speed doesn't change, nor does the screen brightness.  I can reproduce it by simply [un]plugging the machine a few times.  The stack trace seems pretty useless (I didn't have debug symbols), but here it is:

Program received signal SIGSEGV, Segmentation fault.
0x080697bb in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string<char*> ()
(gdb) bt
#0  0x080697bb in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string<char*> ()
#1  0x0806c841 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string<char*> ()
#2  0x401b5ea0 in __libc_start_main () from /lib/tls/libc.so.6
#3  0x0804bba1 in ?? ()

This is on an IBM ThinkPad T40p, running powersave-0.10.15-5 with ACPI.