The nagios monitoring tool has a contrib type tool that does just what you are asking for.

It's called nsclient, and it talks with the windows performance manager. It was designed as a plug-in for netsaint/nagios, but it's easily integrated:

./check_nt -H 192.168.1.1 -p 1248 -v COUNTER -l  "\\Paging File(_Total
+)\\% Usage","Paging file usage is %.2f %%" -w 80 -c 90
./check_nt -H 192.168.1.1 -p 1248 -v COUNTER -l "\\Process(_Total)\\Th
+read Count","Thread Count: %.f" -w 600 -c 800
./check_nt -H 192.168.1.1 -p 1248 -v COUNTER -l "\\Server\\Server Sess
+ions","Server Sessions: %.f" -w 20 -c 30
[download]