Honestly I found Ghostery useless and ultimately uninstalled it. I am not paranoid enough to want to completely deprive every site of statistics, so I had opt-in by default, and it's difficult to block the especially nefarious packages because they're all lumped together with typical counters/stats scripts.

I think NoScript does an adequate job preventing most undesired analyzers, as they will often be on a separate domain that needs temporary activation. Ghostery was just annoying because it'd always be blaring that there were trackers tracking me, but include mostly things that I don't really mind, basically all counters. In fact, I usually want counters to register my UA/OS, so that their recorded Linux marketshare increases.

Would be nice if we could install Ghostery as a private-browsing-only extension and turn its default to block everything, but barring that, I don't think it's valuable unless you make it block everything all the time.

Ghostery is fantastic. It takes a little while to get setup and maintain as you'll want to disable everything by default then reenable services when things don't work. But it's well worth the effort.

I use the Ghostery add-on for Firefox, but if you enable "GhostRank" then the add-on will send every URL you visit to Evidon. This is purportedly for "tracking the trackers", but it does give one pause.

I use this in conjunction with an ad blocker and a NoScripts-like extension.

I always wonder how effective this combination is :/