Subject Lines with better open rates...

--After testing long vs. short subject lines, I've found that subject lines of less than 50 characters achieve higher open rates than those of 50 or more characters. Here's a great tool to help see which subject lines fall within email providers' parameters.
http://www.emaillabs.com/tools/from-subject-line-tool.html

Some other lessons learned:
--Contain emotional drivers (i.e. greed, fear, vanity)
--Ask a question
--Specificty rules (specific $ or %)
--Incorporate well known names in your industry
--Tie into timely news or current event
--Use a powerful call to action
--Forecasts
--Rare events