Link for Dev-401 Certification Exam

Hello All,

I have got some useful link for DEV-401 Certification Exam prepration:

http://www.allaboutsfdc.com

http://www.forceprepare.com

also refer salesforce winter-12 release for updations.
or you can ask me for more detail by comments or for online training.
Register yourself  by "Contact Me" link on my blog for online trainings.

Thanks,
Amit Goyal