Design Business - Database of design agencies, news, and useful materials.
Invision - Prototyping and collaboration for design teams
Conceptzilla - Get competitive design for a fraction of the industry cost
Red Pen - Red Pen lets you upload your design, share a short URL, and get live, annotated feedback super-fast.
Prevue - Give stunning design presentations, get fast client feedback
Pastel - Sticky note-based feedback collection tool for live websites