These are some of the best sources for rubrics and checklists for evaluating student learning. Don't forget to show the grading rubrics to your students before they start the projects. You will be much happier with the quality of their work if you do!

WebQuest Rubric Template and Rubric Collection can be found at this site produced by Education Service Center Region 20 (San AntonioTX) and teachers in that region.
Assessment Rubrics from Kathy Schrock's web site.
Assessment from North Central Regional Educational Laboratory.
Rubrics from the Staff Room for Ontario's Teachers.
Project Based Learning Checklist from www4teachers and the High Plains Regional Technology in Education Consortium (check out the great tools at their site) - This is a cool site where you can easily build a checklist for or with your kids before they write, do an oral or multimedia presentation or an experiment. They will know what to look for when they self-evaluate their work.
RUBISTAR is also from www4teachers and the High Plains Regional Technology in Education Consortium (check out the great tools at their site). Using a similar format , teachers can easily build customizable rubrics for or with your students for a wide variety of project types. Please check these out!
Rubrics from the Staff Development Library of Prentice Hall School.

Alternative Assessment Using Technology (Slide Show) or Handout ; Brian Booth created a thoughtful analysis how the product determines the process.