I saw these LED bulb/fixtures referenced at a tech site, and thought I should post a link here.
They aren't cheap (I don't think C Crane sells anything that *is* cheap... ;) ), but they are another alternative. In particular, this "LED UNDER CABINET LIGHTING" (http://www.ccrane.com/lights/led-light-bulbs/led-under-cabinet-lighting.aspx)light bar looks neat. 12V, too.
(http://www.ccrane.com/images/medium/led-under-cabinet-lighting-24.jpg)
More affordable, and maybe even a better solution for small boats, their "DO IT YOURSELF LED STRIP LIGHTING" (http://www.ccrane.com/lights/led-light-bulbs/led-strip-lighting.aspx) is much more affordable - $24.95 for a 5 cluster/4 LED's per cluster strip that looks like it could be wired straight in to a 12V system (it comes with an A/C adapter as a complete kit for about twice the price).
(http://www.ccrane.com/images/medium/led-strip-light.jpg)
For those of you who are still having to live ashore, :P ;D ;) C Crane has LED bulbs which are made to fit your incandescent sockets. They'll save a ton of money, apparently, even more than compact fluorescents.
There's a lot of cool led lamps in there, I enjoyed looking through it.
There is a site I like and the prices is often much lower (a lot lower in some cases) than many other LED resellers. It's at http://www.superbrightleds.com/.
There's a lot of DIY stuff here as well as "ready made" LED products and controllers.
Both sites are fun to look through and get some ideas percolating! ;D
Here's another site (http://www.superiorled.com/marketplace/product/SL105W25BC-12.asp) that has LED-based lighting equipment.
Another good source is Hart Supply Company (http://www.hartsupply.com/electric_led.htm), which specializes in Sign manufacturing supplies, among other things, and sells Starboard, ABS, Plexiglas, and some neat LED-based lighting fixtures. One advantage of the LED-lighting designed for signs is that most of it is fairly well sealed against the environment, as it is designed to be used in outdoor signs.