After a period of fulltime employment, I returned to contracting. However, the company I accepted a contract with required I become an hourly w-2 with a company on an 'approved' vendor list (while I go through the process of becoming 'approved').

Regarding retirement programs:
* What options do I have for tax-exempt retirement savings programs? (I participated in an employer sponsored 401k for 5 weeks at the beginning of the calendar year and invested approx. $1500).