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.

IncrediBill concluded:

WebmasterWorld administrator, Tedster, agreed:

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.