Colin Wilson's Delphi Components
Delphi 3/4 midi and mixer components. Freeware
Dragon Enterprises
Dragon Flic Player32 and Flic Panel Shareware
Multimedia Tools
Component library provided especially for developing multimedia applications. Easy to use and professional, with visual design capabilities, flexible architecture of components, optimized code and very extensive.
Praktical.com - Ultra Tech Delphi Components.
Organic Shape Pack to make your applications skinable like WinAmp. And PanoMax Panorama Component to render real-time views of panoramic (360 degrees) images, giving a Virtual Reality-like immersion feeling.