Dave,
There are still a fews bugs to work out with the Explorer bar, but if I posted an installer using my API key, I would hit the 500 limit in a hurry :-) There is also the bandwidth and CPU impact of API requests everytime a user loads a new page...any page. I probably hit a few hundred pages a day myself alone...
Thanks for the heads-up on Mozilla. I had checked IE and Opera, but not Mozilla. Mozilla wasn't loading my external stylesheet for some reason. I found the reason and solution in a blog entry from one year ago. Strange that this bug isn't fixed the the Mozilla Beta that I just downloaded. It looks a lot better now, though not perfect.
Regards,
Mark