S&P BSE SENSEX Valuation: All is Fair in Love and Markets

The SENSEX has crossed the 35000 mark and investors are getting a little uneasy. They have voices inside their heads asking "Is the SENSEX running ahead of itself? Should I cash out or should I stay in?" While those are difficult questions to give a definitive answer to, I thought I'd try to come up with a ballpark answer based on market metrics.