One of the things I wish RTM had is the ability to attach support documents for a project. Here's my work-around:
1. I created a list named, "Projects", in which I list every project I am currently working on.
2. In my Evernote account, I create a tag with the same name as my project. In the notebook for my work, I click on my tag. I then copy the url and paste it into my project's url field in the project's attributes.
3. All support documents go into Evernote and are tagged with the tag that's related to my project.

Any time I need to see support documents, I pull up my Project's list, select my project and then click on the URL attribute. I'm taken immediately to my support documents.