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It all looks like it is from the time when only the biggest corporations had their own domains.
And now that you mention it I don't think the bacic design of the REX engine has changed since I first heard of them 5 years ago.
I have submitted several sites in the last year and none of them are listed. IMO it does not look like it is still adding sites. I will probably drop this one from my submission list.
Generally, if it looks like it's got some traffic, it's still a good idea to submit...however, if it's one where like Brad mentioned the only places you find it mentioned are old sites that look so dusty you sneeze when you click on them, odds are it isn't worth your time. :)