In case anyone is unaware of their existence, here are the links to the available genome size databases.
For a summary of the databases, see Gregory et al. (2007).
For a discussion about units of measurement in genome size, see here.
A summary of genome size ranges in various animals is available here.
A much smaller database of genome sizes that also includes some taxa besides animals, plants, and fungi is posted here.
For a list of completed and ongoing genome sequencing initiatives, see the Genomes OnLine Database (GOLD).
For vertebrate red blood cell sizes, see here.