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Click on CACHE link, and the domain G.com is replaced with an IP number: http://64.x.x.x/search?q=cache:eIkR6IhNbd0J:www.mydomain.com/+&hl=en - my content is displayed.
Now in G Sitemaps: under the Statistics tab, then the Index stats sub-tab. I see those same links: related, info, link, etc. Click on the cache:www.mydomain.com from there, and lo and behold: the domain G.com is replaced with http://72.x.x.x/search?q=cache:mydomain.com&hl=en - but the page displayed is my competition's site!
How can this happen? How can he get google to cache his page, but call it mine? Is this some kind of Hijacking or 301 trick? I'm very confused.