Google Chrome 37 64-Bit Stable Released, Faster, More Secure
Stability measurements from people opted into our Canary, Dev and Beta 64-bit channels have confirmed that "64-bit rendering engines are almost twice as stable as 32-bit engines when handling typical web content." And, defense in depth security mitigations such as Partition Alloc are able to "far more effectively defend against vulnerabilities that rely on controlling the memory layout of objects."
As of now, 64-bit support is still opt-in, but if you want to give it a go, it's ready to download from Google's own servers. Presently, the only significant known issue is the lack of 32-bit NPAPI plugin support. The 32-bit channel will remain fully supported for the foreseeable future and we will continue to support 32-bit plugins until NPAPI is removed from Chrome.