I recently came across this great site. You'll find many good lesson plan ideas organized by grade and subject, with an accompanying URL. The database is searchable and each reference has an "In-the-classroom" tip that teachers will find useful.
"TeachersFirst is a rich collection of lessons, units, and web resources designed to save teachers time by delivering just what they need in a practical, user-friendly, and ad-free format. We offer our own professional and classroom-ready content along with thousands of reviewed web resources, including practical ideas for classroom use and safe classroom use of Web 2.0. Busy teachers, parents, and students can find resources using our subject/grade level search, keyword search, or extensive menus."
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