I desperately want to use “green” bulbs, so much so that, a couple of years ago I bought five LED types for use in outside fittings (IMO LEDs are the future of low energy bulbs, not the compact fluorescent).
I then modified them all to fit the lamp holders (because bulbs you can buy don’t match common fittings...great idea!).
It took me the best part of a day and cost £50, but given their very long life and negligible consumption, I would eventually be quids in.
Or not! One bulb failed just after a year, and a second has also just failed.
Nearly every fitting inside the house is controlled either by a dimmer, or a remote control unit/dimmer combination.
Dimmable CFLs are just becoming available but, IIRC, are also getting on for £10 each. To use them would thus cost me about £250 and if they are as unreliable as the “ultra long life” LEDs, would cost £50-£100 a year to replace them.
Both the LEDs and the CFLs are as dull as ditchwater; no problem in some areas, but they are in others.
So, make them reliable, increase light output by at least a factor of ten, make them all dimmable, make them compatible with current lamp fittings, make them small enough so that they can fit into typical lamp holders, and cost £1 and they’ll fly off the shelves.
No doubt we’ll get there eventually, but more development needed.