HSBC Direct 6% APY promotion ends next week
One option is the 5.3% APY GMAC Bank Money Market account, as reported by Bank Deals last week. Interesting timing, but I will be keeping my eye on the T-Bill auctions this week.
According to the new and improved T-Bill tax equivalent yield spreadsheet (courtesy of the FatWallet discussion on Treasury Bills), California residents could have had a tax-equivalent yield of at least 5.5% APY for T-Bills bought at auction last week. If that trend holds up next week, I think the U.S. Treasury will have the pleasure of borrowing my money.