Well for one, there were a lot of tech changes that happened during the RHEL5 framework, they need to stabilize things before they release a stable product.

> There are a number of reasons for the delay, but the biggest is related to the Fedora Project, who create Fedora Core, on which Red Hat Enterprise is based

There is no such thing as Fedora Core any more.

Red Hat 5.4 includes KVM and quite a few major upgrades/new features so the need for Red Hat 6 isn't as strong. Plus Red Hat's revenue model is subscription/support based so they aren't as desperate to force people on to an artificial update treadmill in order to keep revenue up. 

Evidently Fedora is moving to fast for RHEL.

Well for one, there were a lot of tech changes that happened during the RHEL5 framework, they need to stabilize things before they release a stable product.

&gt; There are a number of reasons for the delay, but the biggest is related to the Fedora Project, who create Fedora Core, on which Red Hat Enterprise is based

There is no such thing as Fedora Core any more.

Why isn't Red Hat Enterprise 6 ready yet?