In a way, buying these annuities to guarantee ourselves a safe refuge or insurance from market gyrations is something like the financial institutions buying CDOs or bond default insurance from a company who itself was at risk of going belly up and not delivering the hoped-for insurance. Wait a second, that was AIG, wasn't it? The same folks who are behind so many of the annuities. Hmmm....
I know the trusts for the annuitants are safer and more tightly regulated and so forth than the CDO insurance capital was, but at the end of the day the annuity issuers are investing in the same markets as you and I, and are subject to the same risks and rewards. So if buying the annuity was about buying peace of mind for the next 50 years or so, well, let's just say I don't own any annuities.
Seems to me TIPS may be one of the few actual safe havens out there which could give as close as possible to a guaranteed inflation-adjusted income stream over the long run. But that isn't exactly a secret, and right now they're paying a real 2.5% for a 20-year TIPS (auction on Jan 30 '09), which isn't quite the SWR we're all looking to lock in for the next 20 years... Still if I ever see TIPS real yields up over 3.25% or so I'll be tempted to buy in a meaningful way.
Edit: one little pointer I recently came across is to buy new TIPS as opposed to old 'after-market' TIPS. Reason is that old ones have an accumulation of inflation-adjustment additions added into their price which can be clawed back in the event we ever entered a period of deflation. Since TIPS can't return less than par value, a new TIP would give protection from both inflation and deflation.