Yes Ti frames may be a bit squishy compared to a CF racing frame like the Cannondale Six13, Giant TCR or the Trek OCLV - but how much frame rigidity do you REALLY NEED? Unless you're out there sprinting 35+ mph in USCF events - and maybe even if you are, depending on your size/strength/wattage - you're usually not exactly going to lose a race because you're on a Litespeed, Merlin or Serotta Ti racing bike. So 'flexy' is a relative term here. And the ride comfort that flexibility affords - along with the phenomenal feel of a Ti bike - is something most of you who are reading this with skepticism - would probably come to fall in love with over time.
I've seen both sides of this coin, as I point out at the top of the thread. I've just re-discovered my long term love affair with Ti - and I'm glad I did. My guess is that if I keep riding until I'm 80+ (I'm 48 now) I'll always have a high quality Ti bike at my disposal. And with any luck it will remain the Ibis - until I'm 80+. I DO love the Cannondale too. So the bottom line is that if you're a terminal bike weenie like me - you'll probably want a CF AND a Ti bike : ).