When Google drops a site from the index

New site, one minute indexed in 10 data centres, next minute gone

[Mr Bo Jangles]

Hi all,
I've read previous posts about how new listings appear, then drop dramatically in listing rank, then there's a period of time, then suddenly they adopt their 'true' ranking position, but I didn't think this included the site being dropped from the index completely - does it?

I've been having a deal of trouble just getting Google to even index it (worry about rank later), then suddenly it's listed -in ALL 10 data centres!, then 24 hours later dropped *completely* i.e. searching for www.widgetinc.com
comes up with one link (to my site) from another site. So it appears to be stripped from the index.

What does this phenomenon indicate? Penalised for some reason?

thanks....