To fire back at the snarkiness (

) from a CM standpoint, in the long run the letter may do them more good than the little extra tip. It is GREATLY appreciated by CMs for guests to send letters to guest relations about an outstanding job they've done. We are rewarded with different certificates (guest service fanatic cards, applos-o-grams, etc.) that go on our record and if we ever choose to apply for a transfer or promotion within the company it is taken into great consideration. You can e-mail them at
wdw.guest.communications@disneyworld.com and be sure to put in your name, phone number and e-mail so they can easily respond to you. Disney will then in turn pass on your communication to the appropriate manager/supervisor to make sure the CM gets recognized.
For the future, if you encounter an exceptional CM while you're in the parks/resorts, seek out that person's manager. They're normally the ones walking around in business clothing, wearing a nametag and an earpiece in their ear or a blackberry attached to their hip. They'll be able to immediately recognize the CM. If you can't find a manager ask the nearest CM from that department (so if it's an attractions host from IASM, make sure you ask another IASM CM for their manager). They'll point in you the right direction. You can also go to Guest Relations while you're in the parks and they'll make sure to get the acknowledgement to the right person. Hope that answers your question fully and THANK YOU for recognizing a great CM! It is truly appreciated!
P.S. Some people choose to go right to Meg Crofton (head of WDW) but in my opinion using the guest relations e-mail will get you just as far. If the letter needs to get to Meg, it will either way. =)