I agree that its a longtail domain, but it does zero in on a specialty which is hard to do with 14 letters or less. Might do well with an end user sale, but the plural may hurt you as it has portal/directory written all over it.
A good way to tell would be to post it on ebay w/ a reserve of what you thinks its worth to you. Let the market tell you what it thinks. Keep your expectations low given the current economy. You'll have less than $20bucks in it and it might be just what you need to know. It's alot cheaper than say a "manual" appraisal.
IMHO,
You won't command a substantial ransom from a reseller: Mid $XX at best
End user, possibly mid-low $XXX to very low $X,XXX