Kevin [1] wrote in about Reader's Robot [2], an online, submit-it-yourself readers' advisory service. Free replacement to amazon comments, anyone? :) According to Kevin, "It's quite clunky, as I learned perl (starting with version 4!) writing it." Glad to see this is already happening...
Links:
[1] mailto:kkierans@tnrdlib.bc.ca
[2] http://www.tnrdlib.bc.ca/rr.html