Very little difference between the two nowadays. Plasma still has the edge on color and viewing angles. It generally comes down to what will be the main use of it. If you intend to hook it to a computer system everynow and then, LCD would be better in the long run.
Check out these articles. They were written fairly recently.
http://www.cnet.com.au/tvs/0,239035250,240036500,00.htm
http://www.lcdtvbuyingguide.com/lcdtv-plasmavslcd.shtml
http://tv.suite101.com/article.cfm/lcd_vs_plasma_vs_dlp