@pone - The rare SNP analysis download is at http://sourceforge.net/projects/analyzemygenes/ . It generates a list of your rarest 23andMe results (1% prevalence or less), which you can then look up online to see what genes they're on and if there's any interesting research regarding those SNPs.
On the "files" tab there's also the option to download a file which allows you to search for your SNPs with 10% prevalence or less, which can be nice if looking for homozygous results.
On the "files" tab there's also the option to download a file which allows you to search for your SNPs with 10% prevalence or less, which can be nice if looking for homozygous results.