I do not understand the difference between Red Hat 9.0 and Red Hat Entreprise Linux. Could anyone explain me clearly ?

Enterprise is (i think) supposed to be more stable and they will offer support for it but you pay for it.

Personally i dont understand how you can make it "more stable". I guess by taking out most of the fluff and bloat that comes with non "Enterprise" redhat releases.

I personally think it's all just a part of marketing. Those guys love to word things to get you to feel better about buying stuff. I have seen red hat 6.2 servers run for almost a full year without needing a reboot (the one im thinking of in particular came down with a bad case of ssl slapper).

So this "more stable" stuff and "enterprise" stuff seems to be geared to convincing companies that Red Hat Linux is for them.

You may get a better answer from someone who isnt bitter about the current situation with red hat.

Spent some time reading through the many pages here:
http://www.redhat.com/software/rhel/