The following articles were pretty interesting to read through:

• Joe LaGregor was the manager at the Four Seasons Bowling Alley in Union, NJ when Frankie Valli and the 4 Seasons were known as the Four Lovers. [The Star-Ledger]
• Newsday has a good history piece on Jersey Boys and The 4 Seasons.
• Dana Tyler @ wcbstv.com as a "Top News" article on the Broadway production.  There is also an online video.
• A good collection of little known Frankie Valli and the 4 Seasons facts.
• Some great cast pictures from BroadwayWorld.com.