Today I found listed in the TechLEARNing blog a link to the Oregon Trail website. Here's a description from the site:
This web site is brought to you by teachers Mike Trinklein and Steve Boettcher, creators of The Oregon Trail, the award-winning documentary film which aired nationally on PBS. During the three years we spent researching the film, we found lots of great material we thought would be great for teachers and home schoolers--so we built this this web site to make it all available. Enjoy the adventure! (If you are a teacher, don't miss our free online teacher's guide)
There's plenty to explore here, including diary entries and letters from 9 people who traveled on the trail. Some really interesting, fascinating information!