There are a few webquests/miniquests on this site. They are listed they are grade and subject specific. There's not a lot to work with but it may still be helpful.
This site offers WebQuests for teachers and students. It starts with "A presentation for teachers on why to use WebQuests." Nellie, the site creator, has categories of different age groups, ESL students, and adults. She offers webquests for: Classroom Management for Technology WebQuest for Preservice Teachers, Put your school on the web, Electronic Portfolios, Building a Website, and much more.
A site with dozens of webquests for topics such as: Native Americans, Explorers, Early Settlers, Revolutionary War, Solar System, Phases of the Moon, weather, the Olympic Games, and much more.
Site offers: 100 templates; preview before publishing; unlimited pages; quiz creation, photo gallery, and other interactive modules. It also offers a variety of topics from English, Math, and Science to Business, Foreign Languages, Technology and more.
This one doesn't offer a lot but I felt it was still worth sharing. The curriculum in this one is free and they offer a grant of $50 to help with supplies you would need for the lessons. Also, they offer elementary, middle, and high school versions.
This site gives you help with developing a curriculum for your classroom, including adjustments to consider for special needs students. It gives you four "P's" of lesson planing: plan, procure, procedure, and prepare. It has so much more
I think Weekly Reader is one of the best curriculum suppliment resources. I used it every year I was home schooling my daughter. One of the things I love about it is that it is always current. For example, one of our 2008 issues for children grades 4-6, discussed our process of voting for president and gave the children the opportunity to vote for president. It's not just for elementary levels either; it goes all the way to 12th grade.
In this site you can access model curriculum supporting the state standards. You can select quarterly units or individual topics. These models provide sample that offer description, time frame, sample ideas, sample questions, vocabulary, resources. Individual models show the standards that will be mastered, gives instructional strategies, samples of instructional resources/materials that can be used, and even lists some common misconceptions related to the lesson. Unfortunately, it only provides for Language Arts and Mathematics but it could be a great base for creating your own plans in other subjects.