After discovering one of my own photos ripped off and used by someone on Twitter (quite by accident) I realized the importance of what I post and watermarking my images. I discovered one of the best tutorials by Darlene of "Her View" on how to create a beautiful transparent watermark using your own logo in both Photoshop and Lightroom.
Check out her photography-filled-site packed with interviews, tutorials and awesome tips and tricks. If you sign up for her email updates you will receive the free ebook "Ten Photography Challenges to Improve Your Photography" - the link takes you to her 'about' page where you can fill out the form to subscribe.
Herewith is her video tutorial to create a beautiful transparent watermark: