Is There a Tool That Helps Find Domain Availability?

[nam6641]

anyone know of a tool (free or paid) that helps you determine if domains are reg'd.

either you input the domain names and it checks if they are registered (in bulk i mean, like a list of 10,000 domains)...

or even better, a tool where you give it guidlines (like CVCV.com) and it generates the list and then checks if they are registered??