We are planning to go with the Seagull Lighting Low Voltage Linear lighting -- which uses removable xenon bulbs and is dimmable. Basically, the cable sits in shallow track under the cabinet, and you clip on the lamps. We'll have a light rail, but it's so low-profile I think it would probably work without one. (If your cabinets are flat, you'd still be able to see the lights, though, so you might want to choose something "prettier" or add a light rail molding.)

Here is a link that might be useful: Seagull Low Voltage Linear Ambiance Undercabinet Lighting

Have a look at www.Environmentallights.com and the thread below. Also www.Superbrightleds.com Search this and the lighting forum. More than enough info.

Here is a link that might be useful: Garden Web