The use of two title tags on a single page was something that was used by old school SEOs back in the old days. However, it was reported at WebmasterWorld just a two days ago that Google has ranked and used the title of either title tag depending on the keyword query entered into Google.
For example the title tags might look like the following in the source code: <title>Keyword Phrase One</title> <title>Keyword Phrase Two</title>
If someone typed in "Keyword Phrase One" in Google it would display "Keyword Phrase One" in the hypertext link in the search engine results page. If someone typed in "Keyword Phrase Two" in Google it would display "Keyword Phrase Two" in the hypertext link in the search engine results page.
Get get your hopes up yet, it seems as if Google fixed the loop hole the following day.