Answers:

•  Google has overwritten your title element with a title taken from the Yahoo! Directory.

• Your title does not contain your brand name or other key terms in the users' search query (or doesn't include them at the start of the title element), so Google is using text from elsewhere on the page.

• Google is pulling a title for your webpage from one you entered into an AdWords ad for that URL (that produces a higher clickthrough rate).

• Your page contains the meta "title-h1" tag specifying that Google should use the text within the H1 in place of the title element for the search results listing