Matt over on Techlore has created an excellent CE (Consumer Electronics) Customer Support Contact List which should come in handy for new users of various gadgets received as presents this Christmas.

Also, PVR Wire put out a customer support contact list for the DVR community: 

Service Providers

TiVo: customer service web page, phone number: -877-367-8486. If you have a DirecTV TiVo unit, you should call 1-800-347-3288 instead, or you can send an email instead.

DirecTV's Customer service page should help if you have a non-TiVo PVR from the satellite provider. Or you can call at 1-800-494-4388.

Dish Network: Customer service page and contact number: 1-888-284-7116.

Comcast: Frequently Asked Questions, customer chat, and contact number: 1-800-COMCAST

Charter Communications: Support page, email, and contact number: 1-888 GET CHARTER

Time Warner Cable: Customer service page, or you can find the number for Time Warner in your region here.

Hardware makers

Hauppauge: Support page, email, and contact number: 631.434.3197

Miglia: Technical Support page

Sling Media: Support page, and contact number: 1-877-467-5464