what does this mean?

[goneinthesun]

My site used to rank very well with google. It had a pagerank of 7.

But now it disappear from all major keyword with google.
when I do a search with site:www.mydomain.com it should no result. But if I search with site:mydomain.com it still show some result. I still have my page rank of 7 but are not getting any traffic from google.

What does this mean? Any input or advice would be greatly appreciated.