What will cause ranking dropped?

[simonhe]

I have a site that has some good rankings on Google,such as J.Jill coupon. Especially before Feb 8th 2005,most of keywords appeared on top10.

But now these keywords all dropped between sixth page and tenth page. I can't do anything to cheat Google. Who could tell me that's why? Generally, what will cause it?

Thanks

[DaveN]

was it all original content or was it a feed ?

DaveN

[simonhe]

Of course, DaveN, It's all original content. But we will syndicate some content (information) to our partners.

Did it affect our placement? If so, what should I do then?

Thank you in advance.

[simonhe]

Have anyone known disadvantage of my site?
Could anyone help me?

[Mel]

The short answer is that Google have implemented several algo changes in the past couple of months and this results in some people ranking better and some worse.