Here's a very informative site. Cornell University has assembled a pretty encompassing list of poisonous plants, species affected, and what symptoms it causes. There is an alphabetic list by botanical name as well as common name along with a frequently asked questions segment. Cornell also provides links to other poisonous plant informational sites.

Letsdigit.com is a great site I learned about a few days ago. There's a myriad of information ranging from how to plan various types of gardens and garden features, to how to make your own garden pots and baskets. There's a tips and ideas page that includes such gems as storing trowels and hand forks on a tool rack using an old slipper as well as a method of picking up tomato seeds using a dampened match stick. There's even a quiz to test your gardening knowledge. If you guess correctly you get applause, if incorrectly you get a disappointed chimp shaking his head. Take some time and go visit this site. You'll enjoy it.