Follow @salesforcedocs on Twitter to stay abreast of the latest updates to your favorite docs, or to learn about new doc releases before anyone else! We update our twitter feed as soon as new docs are available, or when we've made significant updates to existing docs like Force.com Fundamentals, the Visualforce Developer's Guide, or the Force.com Workbook Tutorials.

You can also learn about all the significant updates we've made to our developer documentation since the new year by reviewing the "Force.com Platform Documentation Enhancements" section in the Summer '09 Release Notes. Check it out!