Other than Design Observer, AIGA is a good way to go.
It’s the profession’s most oldest and professional organization for design with over sixty chapters and new members coming in every year. They provide professional development and an understanding of the value of design and designers in government, business, and media. Whether you’re a design enthusiast, student, freelance designer, in-house designer or anything else , AIGA is there to welcome you into the wider world of design.
To learn more, click on the link to find out.