The ASPCA just released some interesting information on the top 10 causes of pet poisoning in 2010. Everyone is very familiar with antifreeze (which was actually #10 on the list).
The #1 most frequest cause of poisonings in dogs and cats was ingesting human medications. This accounted for 25 percent of all calls their poison hotline received.
Check out www.aspca.org to see the rest of the list.