The DCMP has a list of vendors that they certify for quality captioning at http://youtubeready.dcmp.org/
These are vendors that you can trust to provide quality professional captioning services.
CCAC provides a list of people offering free services
http://ccacaptioning.org/resources/
Feel free to comment on any captioning services that you’ve used, or resources for a compiled list of captioning vendors.
billcreswell.words 
http://exchange.kaltura.com/category/solution-types/captions
http://pro.amara.org/ondemand
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Hi, Bill.
I’ve just launched an online service to help people find and compare captioning vendors, services, and rates. I’d love the opportunity to talk with you about it. Please let me know when you might have some time.
– Michael
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