Here's a few more grains of salt to take along with all the poll results being thrown at you.

Same polling company, different caller --  different results.

When they used a computerized Robo-caller to poll voters, McCain received 26% to Huckabee's 26%.  If an actual human was used to make the calls, then McCain pulled away with 34% to Huckabee's 21%.  

Ron Paul's numbers were also significantly different.  His support dropped from 5% to 1% when humans did the polling.

Are voters reluctant to admit they are voting for Mike Huckabee or Ron Paul?