3D Cafe :: tons of tutorials, models, textures, plugins, and anything else related to nearly any 3D app available.
Renderosity :: lots of tutorials for 3D work, but also includes tuts for Paintshop Pro, Photoshop, and other graphics apps.
Lightwave Group :: Lightwave-specific tutorials, files, and galleries. Highly active forums as well.
Polycount :: numerous tutorials aimed at 3D modelling for game applications.
Macromedia Flash tutorials
FlashKit :: anything you need for Flash-related stuff. Tutorials, files, samples, and a decent wad of fonts to boot.
Adobe Photoshop tutorials
Phong.com :: a generous selection of excellent Photoshop & Flash tutorials. Photoshop tutorials are suited for both beginners and experienced users.
Polykarbon :: Photoshop effects tutorials aimed at cartoonists. Also includes lots of basic drawing tutorials for anime-style line art.