Adams Bank & Trust has extended its 4% rate guarantee on its reward checking account. It's now guaranteed to last to 8/31/2010. The rate applies to the first $35K, and then it's 2% for above. Two downsides: 1) Requires 25 debit card purchases a month and 2) $7/mo fee if requirements are not met. Branches are located in Nebraska and Colorado.
Please refer to my account review
for more details.
Do you know of any other reward checking accounts with rate guarantees?