SERP dropped overnight in GOOGLE

[markov]

Till August 13, 2007, I did have a decent SERP in Google, but the next morning all of the sites disappeared from the top places. No where in the top 20..or even top 40. Even the blog results disappeared overnight. What could be the reason?

That was the issue when Google Webmaster tool reported that the site has been crawled on Aug8. But today when i checked out the same, the last crawled date was on Aug13. Interestingly from Aug13th onwards, I'm facing this problem.

It may be on Aug6th or so ... I've changed the images in my site something like from superaffiliatehandbook.jpg to superaffiliatehandbook-affiliate-marketing-ebook-graphic.jpg .

Is this anything to do with the fall of SERP? Except this change i've nothing added or deleted.

Please help me in this regard.

[markov]

Updating on my site SERP problem,

On Sep 2nd I noticed that my site got its place back into the Google...this time on 2nd page. But sometimes I see there...the other times...it's again off...no where again. Immediately on the next day Sep3rd the site again vanished. May be something like DANCING. So presently what i could do is...leave that for sometime.

Most of the members feel that I should add the content to the site. But in my website I review the products ... so addition of the content on regular basis is not possible. Only possibility is that the content can be modified.

So keeping in mind, I've started a BLOG at my site with something like http://www.example.com/blog . I used to post articles in the BLOG. Even that got good SERP. But last week, I've started a new blog (http://www.someXYZ.com) thinking that a new domain will be fresh and seperate.

So the present problem is should i consider updating the old blog which has url extension ....or should I go with a brand new domain.

Please do suggest me the BEST option.