In case anyone's curious... I'm going to bed now.
tail -f debug.log | gawk ' BEGIN{ last=systime(); start=1318289700 } /SetBestChain/ { now=systime(); block=substr($4,index($4,"=")+1); blockrate=(now-start)/60/block; toofast=3.5/blockrate; print now ": block# " block " - " now-last "s (" blockrate " minutes/block, " toofast " x)"; last=now }'
1318317428: block# 9898 - 0s (0.0466896 minutes/block, 74.9632 x)
1318317430: block# 9899 - 2s (0.0466882 minutes/block, 74.9654 x)
1318317432: block# 9900 - 2s (0.0466869 minutes/block, 74.9675 x)
1318317434: block# 9901 - 2s (0.0466855 minutes/block, 74.9697 x)
1318317442: block# 9902 - 8s (0.0466943 minutes/block, 74.9557 x)
1318317444: block# 9903 - 2s (0.0466929 minutes/block, 74.9578 x)
1318317452: block# 9904 - 8s (0.0467017 minutes/block, 74.9438 x)
1318317452: block# 9905 - 0s (0.046697 minutes/block, 74.9514 x)
1318317458: block# 9906 - 6s (0.0467023 minutes/block, 74.9427 x)
1318317459: block# 9907 - 1s (0.0466993 minutes/block, 74.9476 x)
1318317464: block# 9908 - 5s (0.046703 minutes/block, 74.9417 x)
1318317467: block# 9909 - 3s (0.0467033 minutes/block, 74.9411 x)
1318317471: block# 9910 - 4s (0.0467053 minutes/block, 74.9379 x)
1318317476: block# 9911 - 5s (0.046709 minutes/block, 74.932 x)
1318317482: block# 9912 - 6s (0.0467144 minutes/block, 74.9233 x)
1318317485: block# 9913 - 3s (0.0467148 minutes/block, 74.9228 x)
1318317489: block# 9914 - 4s (0.0467168 minutes/block, 74.9196 x)
1318317496: block# 9915 - 7s (0.0467238 minutes/block, 74.9083 x)
1318317496: block# 9916 - 0s (0.0467191 minutes/block, 74.9158 x)
1318317497: block# 9917 - 1s (0.0467161 minutes/block, 74.9207 x)
1318317502: block# 9918 - 5s (0.0467198 minutes/block, 74.9148 x)
1318317503: block# 9919 - 1s (0.0467167 minutes/block, 74.9196 x)
1318317509: block# 9920 - 6s (0.0467221 minutes/block, 74.911 x)
1318317512: block# 9921 - 3s (0.0467224 minutes/block, 74.9105 x)
1318317515: block# 9922 - 3s (0.0467228 minutes/block, 74.9099 x)
1318317520: block# 9923 - 5s (0.0467265 minutes/block, 74.904 x)
1318317525: block# 9924 - 5s (0.0467301 minutes/block, 74.8981 x)
1318317532: block# 9925 - 7s (0.0467372 minutes/block, 74.8868 x)
1318317537: block# 9926 - 5s (0.0467409 minutes/block, 74.8809 x)
1318317541: block# 9927 - 4s (0.0467429 minutes/block, 74.8777 x)
1318317544: block# 9928 - 3s (0.0467432 minutes/block, 74.8772 x)