Here is a website from the OCC you can check out for more info on all types of check fraud and preventative measures:
http://www.occ.treas.gov/chckfrd/chckfrd.pdfI would also recommend common sense stuff to look for- Is the customer writing frequent checks to and from themself or their business? Are the deposits similar to the withdrawals? Frequent NSF activity? Do they have multiple accounts at your institution that they are transferring money in and out of? What would you do when a kiting scheme is identified? Just some ideas.
Also, there are reports your bank can review. For example, any large deposits of $25k or $50k, with less than x# of checks.
Hope this gives you some ideas!