Unfortunately plasmas can suffer a "burned in" image as well.
They have actually made significant strides in reducing that issue. It is barely a problem. However the more important issue, cost, is still a big problem.
A nice comparison between a large LCD TV and a plasma screen TV is the difference between regular DVD quality movies and Blu-Ray movies...it doesn't make a whole lot of difference. Really a matter of how large your wallet is.
OLED screens do look interesting and come with many significant benefits over existing displays; almost paper-thin, no need for backlight, more even lighting, uses less power, generates less heat, etc. Main problem is that the manufacturers will have to retool entire production lines to get the product out to consumers...like most technology this means the early adopters will get nailed with really high prices.
Most reports I have read state that consumer-grade OLED screens should be available by 2011...at a price. My guess is that they will become a viable option around 2014.
In terms of resolution, contrast and functionality, a 30" monitor is probably the best you can do. Projectors can make larger screens but often lack a decent resolution and the contrast ratio is comparatively poor. CRT's are bulky, generate a lot of heat and typically don't match the performance of an LCD monitor. LCD TV's simply lack resolution...most only use enough data to adequately fill a 19" computer monitor and use scaling to fill in the rest.
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