The BIS forum has a post about
ArmA: Monitor web-site.
It's very similar to the
Armed Assault Game Statistics - Server List mentioned above, but seems to be faster.
It has pages like:
-
Main entry page (stats server selector)
-
Server list
-
Buddy list feature
-
Server stats (OGN example)
It might be early days for it, but it looks very promising.

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Just to keep these related topics in one place, I'll mention
Kegety's ArmA Launcher v1.11 which has a:
- built in server list monitor (similar to ArmASpy above, where you need to add your favourite servers manually)
- mod selection (instead of manually modifying the shortcut)
- TrackIR launcher
