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Look at the below link
http://wiki.developerforce.com/page/Documentation
These are some sources I referred when I was learning:
Salesforce Pages Developers Guide
http://www.salesforce.com/us/developer/docs/pages/salesforce_pages_developers_guide.pdf
Salesforce Apex Language Reference
http://www.salesforce.com/us/developer/docs/apexcode/salesforce_apex_language_reference.pdf
Others
http://docs.huihoo.com/salesforce/force.com-cookbook.pdf
http://uploading.com/files/thankyou/1245baf5/Force.com.Developer.Certification.Handbook.DEV401.pdf
One of best Podcasts
http://itunes.apple.com/us/podcast/salesforce.com-training-certification/id325668840