I could not resist any longer, despite no substantial need for yet another light in the house, and anticipated buyer's remorse to do with ewaste, I got my first LED desk lamp which will also serve as my main room light - JANSJÖ, aka Ikea Jansjo LED light. This also puts me one step onward away from mercury enriched compact floros and even further away from the unmentionable incandescents. I think this is progress.
Also made my first pilgrimage to The Promised Land that is IKEA via public transport.
I would guess that the lamp uses a Luxeon Rebel LED, but not sure at this point without ripping it apart for examination or more web research.
[Revision 20081011: Just an arbitrary revision; thought I would add a pic of the LED in real life because why not, also I am a fan]
[Revision 20081106 : For any pundits out there, here is a photo of the power supply with specifications inscribed - model ELP03PA1-A constant current DC600mA 2.6V to 3.5V]