There's a whole pile of new and updated documentation for MT4 that we've been working on updating, based specifically on the requests we've gotten from the community and from developers. Some highlights:

• An all-new introduction to the MT4 Developer's Guide. All of the developer documentation available has been better organized, so it's easier to find.
• Transformer Callbacks documentation, for plugins that change the way MT4's screens look.
• Object Callbacks documentation, to create plugins that hook into the core object actions that make MT4 go.
• Information on how to package your plugins.
• And one of the coolest new features in MT4, how to build MT Dashboard Widgets.
• You can even go all the way and create entirely new screens within the application.
  

Do you lean more towards the design side of things than the developer side? No problem. You'll want to check out:

• MT4's Comment Templates for Users of MT3 or Earlier, A.K.A. "MT4 templates for mere mortals". If you've been confused or intimidated by all the includes and variables in the new MT4 templates, this is a great place to start.
• An introductory Designer's Guide to MT4 Templates, which is a great place to get started.
• A practical example of how to create comment feeds.
• And one of the most handy new features in MT4, how to use MT4's widgets on your site.

We'll of course be continuing to update the documentation based on your feedback, and in collaboration with the whole community. And of course the growing MT4 wiki is a hub of idea-sharing as well. We encourage you to read up on all the new docs, and feel free to suggest the ideas you'd like to see covered in the documentation next -- they may well already be under way!