My website was earlier ranked at position 4 for a very good keyword, though it was not there in my title tag. however, when i included it in my title tag, my website position dropped at position 23 in just 2 days! does it mean that title tags are no longer important in determining the SERPs?
Might be due to some negative reputation of your website! Check out your Google Webmaster account for additional details.
Their importance is reduced by SE alogorithms, due to spamming of keywords and abuse of meta tags by adult sites. hey are not completly dead, Bing & yahoo still make use of them in their se alogorithms for ranking websites. So there must be someother reason for the 'drop'. Hope you get it sorted.