Yes there's many ways to query for this information in vCenter.
Check out this cool tool written by the great Alan using PowerCLI to locate snapshot offenders: http://www.virtu-al.net/2009/06/22/powercli-snapreminder/
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William Lam
VMware vExpert 2009
VMware ESX/ESXi scripts and resources at:
Twitter: @lamw
VMware Code Central - Scripts/Sample code for Developers and Administrators
VMware Developer Community
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