Here are mine:

AS Flyer (flew with him on a red eye to MCO but also appreciate his contributions to this FT board)
Alaska F/A (never flown with him but met at SFO Gold Lunch and also appreciate his contributions to this FT board including the updates at LAX)
unknown: F/C F/A AS102 6/17/2007 ANC-YYR-SFO. This was before I made Gold and didn't have a Gold Thank You Certificate. I never caught his name but the old lady seated next to me and I both thought his service was exceptional. I think he was working with his wife who was a F/A in Y.
unknown: F/C F/A AS59 6/7/2007 SEA-JNU. Nice lady. Kept everyone in F happy. Never disappeared during the flight except to maybe help the F/As in Y clear trash before landing. Took time to interact with FC passengers.
Vicki: AS344 9/6/09 SEA-OAK FC F/A: Great service.
unknown: AS flight unknown date but before elite status. PDX-OAK F/A Y. Noticed I had scarfed down the bags of pretzels while she was still passing them out to nearby passengers. 2-3 more bags magically appeared on my tray table without me having to say anything.
unknown: AS flight unknown date but before elite status. PDX-OAK F/A Y. I had ordered a full soda with a plastic cup and a male Asian F/A in Y came and brought me another full cup of ice without my asking. He had noticed the warm soda had melted the ice in the original cup.

Sorry for the length but those are the ones that stand out to me right now.