Using psd2css online is simple. Here are some tutorials to get you started:
Tutorial 1: The Simple Example
Tutorial 2: But I need text in my page! (updated video tutorial)
Tutorial 3: The Gimp and layers named '_text' (video tutorial)
Tutorial 4: More Control By Naming Your Layers
Tutorial 5: Make Links and Buttons with your Layer Names (video tutorial)
Tutorial 6: Image Rollovers for your Links (video tutorial)
Tutorial 7: Forms and Centering your webpage (video tutorial)
Tutorial 8: Menus! Create working animated menus without writing any code (video tutorial)
Tutorial 9: Web Pages that expand with your text (video tutorial)
Tutorial 10: Floating DIVs - Wrap your text around some images (video tutorial)
Tutorial 11: Use '_basename' to create reusable components for your web pages (video tutorial)
Tutorial 12: Scrolling Content in your Webpage Without Writing Code (video tutorial)
Tutorial 13: A Close Button for content your users can close (video tutorial)
Tutorial 14: Put a Professional Image Gallery into your pages without writing any code (video tutorial)
Tutorial 15: User Comments for your Pages (video tutorial)
Tutorial 16: Put a Live Twitter Feed on your page (video tutorial)
Tutorial 17: Full Page Background Texture or Color (video tutorial)
Tutorial 18: More Menu Stuff - Hover Menus (video tutorial)
Tutorial 18: More Menu Stuff - A Calendar Based Date Picker Field (video tutorial)
Tutorial 19: Multi-Page Website from a Single Photoshop File (video tutorial)
Tutorial 20: Drupal Themes from a Photoshop File (video tutorial)
Tutorial 21: Custom Regions for your Drupal Themes (video tutorial)
Tutorial 22: Custom Landing Page for your Drupal Themes (video tutorial)
Tutorial 23: A Simple Online Store from Your Photoshop Design (video tutorial) New!
Here are some other examples:
http://psd2cssonline.com/tutorials/menu2/index.html
http://psd2cssonline.com/tutorials/page1/index.html
http://psd2cssonline.com/tutorials/template/index.html
http://psd2cssonline.com/tutorials/forms/index.php