It'd be interesting to see some compilation times in the (other than that) great reviews performed by the Phoronix team - there should be a specific couple of GCC-Version, and, say, a Linux Kernel snapshot, which is run with its default config via "cd /usr/src/linux/ && make -j$NUMBEROFTHREAD" (where $NUMBEROFTHREADS could be the same for all test (e. g. 4), or a fixed number per core, to make the banchmarks somewhat future-proof). Then again, there could be a second benchmark, compiling the same Kernel snapshot at the time with the most recently released GCC.
This on one hand would give users a clue about what to buy if they strive to cut compilation times, and on the other hand give insights about the progress of GCC development.
We do perform compilation tests in many of our articles using GCC. Primarily we use LAME v3.96.1 as the standard application for compilation; however, we have been testing alternative replacement programs to compile as well.