First off, avoid digging at it with anything, including your fingernails, that may damage the paintwork.
Apparently substances like alcohol or even WD-40 applied using a cotton ball (like the little jobbies for cleaning your ears) can get pine sap off.
Ive never had any experience of big blobs of sap, but reading some of the info in the states it seems they experience this more often, and the alcohol solution seems to be best, but you will need to re-wax the area afterward.
hope that helps.