Job hunting might be the only thing on your mind after losing a job, but don't let your 401(k) from your previous employer slip through the cracks. Deal with wrapping up those loose ends before diving into the job search head first, otherwise you're more likely to indefinitely postpone the task.
Your 401(k) savings can be rolled into a Traditional IRA account without penalty. The bank that holds your IRA account will have paperwork for you to complete and will initiate the rollover. Your 401(k) will be liquidated and funds amounting to the account's market value at the time of liquidation will be transferred to your IRA account. From there, you'll need to rebuild your retirement account by choosing new investments. You could try and hold off until you've found another job and roll your retirement savings into your new employer-sponsored retirement plan, but there's no guarantee your new job will offer one.