Over time I'll add links to postings on CRCs that I find interesting or entertaining:
Nigel Jones has an essay on how we don't always stop to think about whether what we're doing is actually good enough, even if it is what we've always done. In this case he's talking about CRC selection.
(link: Thoughts on BCC's, LRC's, CRC's and being experienced)
Lammert Bies has a Q&A forum about practical implementations of standard CRC functions.
(link: Error Correction and Detection Forum )