Cut and paste the text from one of your templates into an e-mail message. Remember to personalize it based on the site you are requesting a link from.
Do not send out mass e-mails, as this may trigger an alarm on a major ISP that you are sending SPAM. Not to mention mass automated reciprocal link emails like this ARE SPAM. Remember to include the tag line at the bottom, to help ensure that you do not get reported as sending SPAM. Better yet, you could only email webmasters that have a clear reciprocal link exchange policy on their site.
After exchanging links it is a good idea to send the web master back a thank you note for the link, and to let them know that if they ever need any changes made to the link to let you know.