From anchorage television station KTUU:
WASILLA, Alaska -- Gov. Sarah Palin will resign her office in a few weeks, she said during a news conference at her home Friday morning.
The governor gave no reason why she will resign, but there has been much speculation that she intends to run for the 2012 GOP presidential nomination.
Update: A tweet from the governor:
"We'll soon attach info on decision to not seek re-election... this is in Alaska's best interest, my family's happy... it is good, stay tuned"