The GCC 4.5.1 announcement came within the GCC 4.5.2 status report issued by Novell's Richard Guenther. This status report can be read on the GCC mailing list. The number of P1 regressions is fortunately still at zero while the P2 regression count is down four but the least severe regressions (P3) are up by ten. GCC 4.5.1 should now be available from the GCC mirrors.
For those interested in some weekend reading that relates to this free software compiler, following the initial release of GCC 4.5 we published compiler benchmarks comparing the 4.5 release to earlier versions of the GNU Compiler Collection. We also benchmarked LLVM and Clang against the 4.5.0 release.