i have been doing loads of research into this over the last couple of weeks as i want to upgrade my CRT.
The general consensus that i seem to have found from mags/internet site/forums, is that the two have their own strengths and weaknesses.
in short it appears that plasma is not a spent force (esp as there is a new generation coming next year and sony have re-adopted the technology).
my research has led me to conclude that plasma is better at dark images, overall viewing angle & fast images. whereas the LCD's really excel at true/full HD images (blu-ray & the like).
given that sci-fi & footy (yep, no idea how i got married either!) are my passions, i think plasma is the way to go for me.
at the end of the day i think it really does come down to what you are going to use it for.