OLED ("organic LED") is the display tech of the future. Until we see "true" 3D rendering (holograms or whatever) OLED should dominate. A few of the features:
Contrast: OLED "pixels" can be switched off entirely, allowing near-perfect black levels, and therefore near-infinite contrast ratios.
Viewing angles: The technology is completely different to TFT (i.e. not based around a light-scattering matrix) so the image will be precisely the same no matter what angle it is viewed from. Almost like viewing a picture or other physical static image.
Response time: OLED screens will have a typical response time of around 0.1ms. Clearly this is a huge step up from the 2-8ms response times of LED... "Ghosting" etc should become a non-issue.
Colour reproduction: The range of colours that can be shown with OLEDs should significantly exceed that from CCFL backlighting. We should expect a wide colour gamut to be a standard feature in OLED screens.
High refresh rates: The fast pixel response time should make high refresh rates much easier to obtain than with LCD-based tech. The first "proper" commercial OLED TV (the 31" LG panel - see below) already has 120Hz capability.
Power use: Lower than LCDs. First-generation OLEDs should use around half the power of LCDs under regular use.
Screen thickness: OLED screens are extremely thin... The LG screen below is just 2mm thick, and I'm sure this will be further reduced over time.
Flexibility: OLED screens are flexible, so it's relatively easy to produce screens with curved surfaces. As far as PCs go it would lend itself to "ultra-widescreen" panels with curved surfaces, but there are a million other applications in daily life, once production costs drop far enough.
All in all, OLED screens should be a huge step forward. For the next couple of years they will remain very expensive and in limited supply. But, as with all technologies, as production increases and costs drop they will enter the mainstream. 2013-2014 would be my guess for OLED screens starting to become "the norm" within the high-end TV and PC monitor market.
Whet your appetite with this little video of the 31" LG screen. Of course you can't really see the quality of the image on the screen, but at least you get a feel for the screen thickness and viewing angles