Simon Long has posted a great test exam for the VCP410 exam.
I used it to study for mine.
http://www.simonlong.co.uk/blog/vcp-vsphere-4-practice-exam/

Also take a look at Somins study notes.
http://www.simonlong.co.uk/blog/vcdx-study-notes/

Another great and very usefull help is to use and memorize the vReference Card.
http://www.vreference.com/

Thanks to VCP for the below study sites
http://www.passguide.com/vcp-410.html
http://www.vcp-410.com

And not to forget Scott Vessey who created a great collection of resources for studying
http://vmwaretraining.blogspot.com/2009/09/studying-for-vcp-on-vsphere-4.html