Wayne Studer has on his site "interpretations and analyses of every song written or performed by Chris Lowe and Neil Tennant" -- pretty darn impressive! You can catch the goodness at http://www.geowayne.com/psbhtml.htm
Personally, I think one of the most powerful lines they've ever written comes from Jealousy, on the very melancholy album Behaviour:
I wish I'd never met you or that I could bear to let you go.
I'm sure we've all felt that way at some point in our lives :-(