TV for HTPC
Video games and web surfing often include lots of static visual elements, which can lead to image retention on a plasma if they remain on the screen long enough. On the other hand, plasma has no appreciable motion blur, which is better for fast-action games. LCDs combat motion blur with 120 or 240Hz frame interpolation, but this also causes the "soap-opera effect" when viewing movies. With movies, I prefer plasma for its lack of motion blur, often deeper real-world blacks, and better screen uniformity.
Other factors to take into account include the amount of ambient light in the room and how far off-axis you or others will be sitting. For more on choosing between LCD and plasma, check out this article.
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