I have been optimizing my site for about 8 months, and in fact most of the keywords are ranking very well in the 1st page of google.com.au.
But today morning when i check my site rankings almost every keyword my site is not ranking or pushed to 100th ranking or even more down to google.com.au. On seeing this i was very much disappointed, since til last week i could rank for more than 180 keywords for my one site, and now it has lost its ranking in search engines.
I can't guess what the problem exactly was. In fact the backlinks remains the same. I could also see the last cached was on 19th march 2011.
Please friends suggest me some ideas to get my rankings back in the same position. Or else what i have to do if i need to get the ranking as what it was earlier.