Do the new energy saving lightbulbs work with dimmer switches?

I’d like to switch but most of my light switches have dimmer switches on them.

Will this make the bulb buzz? Do they make these bulbs in a 3 way style since I have many 3 way lights as well?

Also I have quite a few IKEA ceiling light fixures that use bulbs with narrow stems, do they make energy savers like that?

Do you have a brand of bulb to recommend over any others?

I watched Al Gore’s “Live Earth” concert and went on line and promised I’d switch some of my bulbs now I need help inplementing the plan!