Jim,
We welcome your input. No need to walk on eggshells... this is the 'general discussions' forum where almost anything goes.
Your respose was very pertinent since Rocco said he presently searches WINS, so therefore he must have admin rights to WINS. True, in a large organization that would not be the case. Also in a large org the likelyhood of having two users with the same ID in different domains increases and since there can only be one unique record...
Some of the other suggestions like browsing the network also would not fit in a large org.
On thing that perhaps hasn't been mentioned here is making use of logon logs. If you track all logons, then you could simply mine the info out of the log.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.