I have found myself using the Groundspeak home page more often to search TB's because the search field is right there front and centre. I have checked 'remember me' on the geocaching log-in, so when I enter a TB number to search via the entry field on the Groundspeak home page, I go in as 'logged in' to my account directly. It's certainly a lot simpler to seach TB's (which includes coins) in this manner.
I would also like to see this TB entry field added to the main geocaching page search topics.
Thanks to those who replied to this topic. I hope others that read it will reply as well so as this thread stays current and on the first page.