WebmasterWorld moderator posted a detailed thread at WebmasterWorld claiming that he feels the proxy hijacks that Google has suffered from in 2007, and was getting better towards the end of 2007 seems to be 100% cleaned up now.
Therefore, based on all of the evidence presented, I'm drawing a conclusion that Google Proxy Hijacking may be a thing of the past and no longer a clear and present danger to webmasters.
I think this is no longer a problem and welcome anyone to sticky me if they think they're still seeing proxy hijacking in order to review the situation in details.
WebmasterWorld administrator, Tedster, agreed:
From what I have seen recently, Google does seem to have a handle on the problem now. Haven't stumbled over any proxy urls for a few weeks at least.
I personally have not seen any recent complaints that conveyed such a proxy hijack issue in Google. So maybe it is true. Maybe Google has fixed the proxy hijack issue that plagued them throughout 2007 and parts of 2006.
Forum discussion at WebmasterWorld.