walkman - 3:41 pm on Feb 26, 2011 (gmt 0)
Walkman , the same happened to me :
- when I search for site:www.domainname.com , www.domainname.com is on 5th place ( cache date is 26th Feb )
- the first 4 places are other pages www.domainname.com/a-page.html ( cache 23rd, 24th, 26th Feb )
Many years ago, and others can correct me, I saw this as a penalty. Some said it was links, some dupes...
Take a sentence from your index page and search for it, "in quotes." Maybe there's a dupe, somewhere?