Navy Federal Credit Union is still offering a special 6-month CD. Like rates everywhere, this 6-month CD rate has fallen, but it remains very competitive. As of 3/03/09, the 6-month CD rate is 3.25% APY for a $10,000 minimum deposit and 3.00% APY for a $2,500 minimum.
In addition to the 6-month CD special, Navy Federal continues to offer a 4.60% APY 30-month IRA special certificate. Minimum deposit is $15,000. It's not available as a regular CD, but only as IRA CDs (Traditional, Roth and SEP plans) and ESAs (Education Savings Account plans).
These rates are listed at Navy Federal's certificate specials page as of 3/03/09.
In this page there's also a 3.75% 1-year CD, but it has many restrictions which greatly hurt this deal. These include a $5K maximum deposit and a checking account requirement with direct deposit.
For long-term CDs, Navy Federal still has CD rates over four percent, but this requires the very-long 7-year term. The rate is 4.25% APY for a $20,000 minimum (4.10% APY for a $1,000 minimum). These rates are listed at Navy Federal's rate table as of 3/03/09.
Navy Federal has recently expanded their field of membership. You can now be eligible if you have some connection with not just the Navy but also with the Army, Marine Corps and Air Force. Refer to their Eligibility Checklist for the full details. Unlike Pentagon Federal Credit Union, there isn't an easy way for people without a military connection to join.
For more details about joining Navy Federal and opening and closing Navy Federal certificates, please refer to this May 2008 post.
Branches are located around the US and the world. Navy Federal is federally insured by the NCUA (Charter # 5536). It's the largest US credit union. It has $36.4 billion in assets and 3,194,292 members.