CentOS 6 includes Eclipse 3.6.1 (Helios), so it is not possible to install Eclipse 3.7 (Indigo) via Yum.
You can install it manually, as Raedwald explained, or you can use Fedora 16, which sends Indigo.
Since RHEL / CentOS is very conservative regarding software versions, I would not expect Indigo to be supported anytime soon.
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