GCFlearn.org, from the Goodwill Community Foundation, offers over 90 courses on technology basics, the Internet, Microsoft Office, and work and career skills. All the courses are free and available 24/7!
To give you an idea of what they offer, there are 21 topics for Excel 2010 ranging from worksheet basics to conditional formatting and advanced what-if analysis. There are Word, Access and PowerPoint courses as well.
If you're looking to brush up your skills or branch into new areas, give GCFlearn.org a try and let us know what you think!