Hi Gyro!
I didn't compile any x64 extension because there is no official release of PHP in x64 version. In my opinion it is too early to switch to x64.
A few days ago I compiled first extensions for PHP 5.4, but someone reported that APC for 5.4 crashes in some circumstances. So I'm waiting for new stable APC release.
regards
tk1
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dev.freshsite.pl]