Auditing GPO's for machines

[gary () aspectcapital com]

Hi All, 

I am in a situation, where I believe that some of my  machines are not getting my GPO's. Basically I need to see 
whether GPO's are being applied to each machine. Currently I am using GPMC, which can tell me on a machine basis what 
GPOS have been received.(not very productive). However I would like to sweep all 100+ machines at once. Is this 
possible? Does anyone know of a good tool that will do this ? Are there any free tools out there?

Thanks in advance,