Yeah. You're not the only one saying this.
Tweetmeme uses Backtype data, right? (At least when used through Posterous it seems to.)
Also, on Twitter's blog, it says Tweetmeme is now "pointing" to the Twitter button. But it's not totally, otherwise we couldn't get our counts like we are.
We (BackType) don't power Tweetmeme's button — we offer our own, more accurate one. The counts we do are also available via our API, which powers Posterous' button.
Ah, thanks for the rapid reply. (HN is so cool :).
I think the Posterous set-up is what confused my sense of the relationship.
What's the URL? I can try to look into the discrepancy.