Nation of Makers : Nation of Makers is a national nonprofit dedicated to helping support America’s maker organizations through community building, resource sharing, and advocacy, within the maker movement and beyond.
Hackaday : A great website where makers and hackers share their latest projects and news on upcoming technology trends. Leans a bit more on the technical side, but has a great community in the comments section.
DC Hack and Tell Meetup : A great DC meetup where local hackers and makers get together to share their projects. Sort of a cross between open mic night and a hackathon pitch session. Fantastically friendly people.
Pinterest : Pinterest is used for lots of things, but it's a great resource for inspiration for your next maker/design project.