Here, we collect unanswered questions. Please sort them into the correct place in rest of the FAQ when you answer them.
How can I make a graphic interface with MIT Scheme?
Is there a way to directly manipulate environments?
Do you mean Scheme environments, or operating system environments?
What actively maintained wikis, IRC channels, supplemental tutorials, and/or mailing lists would most help an independent adult - or motivated teenager for that matter - learn PLT Scheme with How to Design Programs?
http://schemecookbook.org/ (The Scheme Cookbook) and #scheme-on-freenode is a start.