Internet4classrooms is a site where teachers could spend hours exploring:
http://www.internet4classrooms.com/di.htm - if you click on each topic -teachers are taken to other great sites/resources

This is one of the sites that the Meta-Site link takes you to
http://www.gpschools.org/ci/diff/resources.htm

Everything DI - (http://www.everythingdi.net/midwest_di_%2708.htm) this site contains many resources on DI, but it features resources to differentiate using technology.  It is the best DI site out there!  Grace Smith and Stephanie Throne, authors of several books on differentiating your classroom with technology created the site.  This is what they say:  "Our mission is to equip educators so that they are more self-confident in their effort to teach children of diverse social, ethnic and academic backgrounds. It's also important to prepare students for the challenges of the 21st century. More than ever before, our students must learn to become self-sufficient, lifelong learners who are resourceful and marketable in a "smaller," global economy."

Weblinks for DI - (http://www.wilmette39.org/DI39/links.html) from Wilmette School District, great resources for DI, including Technology and DI