How to choose the text on the submit button in forms?

REGISTER

Username
-----------------------
|_____________________|

Password
-----------------------
|_____________________|

 .------.
| Submit |
 '------'

When designing forms, do you customize the text in the submit button? In the registration example above, would you leave the submit button with the default "submit" text or would you choose an alternative?

  • Register
  • Join
  • OK
  • Go

On other forms such as login, purchasing, updating account, how do you choose the right submission action word? Or do you think it doesn't matter?

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