Adding comma's to post counts (1,000 instead of 1000)

[Unknown553]

I searched and attempted this on my own, but failed in both aspects. It's a simple idea and I'm not sure why it hasn't been done yet, but I think the title explains it clearly. I just want comma's added to post counts to make it "proper." Like 1,000 and 10,000 and whatnot. I want it parsed this way everywhere though, not just in the postbit or memberlist or anything, so I don't know how much more that will complicate things but it's worth a try. Thanks in advance.