The rate table has a March 1, 2008 date, so I called the credit union today, and I was told that these rates are still valid as of May 12, 2008.
According to the CSR, membership is open to those who live, work, worship or attend school within a 5-mile radius of their office which is located in White Marsh, Maryland which is in the suburbs of Baltimore. Other ways to be eligible to join are included in their Membership page. Membership requires a minimum $5 balance in your share savings account. The credit union is federally insured by the NCUA (Charter # 6644).