Audio-Technica ATH-ANC7B QuietPoint Active Noise-Cancelling Closed-Back Headphones, Wired Great cost to performance noise cancelling by far!!!
Sennheiser PXC 250 II Collapsible Noise-Canceling Headphones $60 for Sennheiser's!!! Great value with pretty good noise cancelling for the $$$
Sony MDRNC60 Over-the-Head Headphone Better noise cancelling than the Audio-Technica's but worse sound quality
Bose QuietComfort 15 Acoustic Noise Cancelling Headphones (Discontinued by Manufacturer) Not cheap, but price drop by $40 due to the new QC25s. I use these QC15s everyday and love them