So much for the idea that we're all the same under the skin: http://www.gnxp.com/blog/2008/04/snps-dont-lie.php There was an interesting paper in BMC Genetics back in in February: "Analysis of genetic variation in Ashkenazi Jews by high density SNP genotyping. " They ran 500K Affy chips on 100 Ashkenazi women and on 60 CEPH-derived HapMap (CEU) individuals. They hoped to find greater levels of linkage disequilibrium and lower haplotype complexity among the Ashkenazim, as a putatively bottlenecked population. This would simply some forms of genetic mapping. Some earlier work had suggested that this might be the case - but that earlier work had either looked at a single chromosome or at a small samples from a number of chromosomes.