As discussed in the meeting yesterday, CodeSourcery has a few MinGW patches that I had not merged into Linaro GCC.
I have now investigated these patches, and I'm fairly happy that most are not necessary for Linaro. They're mainly about interworking with Cygwin.
The one exception is this one: http://gcc.gnu.org/ml/gcc-patches/2010-04/msg01214.html (and even that is primarily a GDB issue).
Andrew