I do some specialized app development, and for one of my apps when you searched for the name, my site (specifically the page the app is on) would be the number one result. Now however it appears to have been completely removed from the index.
(One tends to let this type of app go viral, so they appear on many different sites, with many of the same key phrases.)
If I search for 'app-name site-url', I find the app on many other pages in the form of "app-name, the new app from site-url", etc., but my page does not appear in the SERPs.
It is also the first page the app ever appeared on online, so it is quite frustating to know that traffic is now not being sent to my site.
It has been this way for 2+ weeks, and I assume it is some sort of penalty (though the PR of the page is still 4), but I don't know what's going on. I would like to understand, so that this doesn't happen for my apps in the future.
There are some good incoming links to this page from major sites as well.
[edited by: tedster at 4:33 am (utc) on April 20, 2009]