Brian Clifford. Turned objects gallery of course, but also plenty of tips and tricks, jigs and complete projects described step by step. For beginners, don't miss the small video clips about basic shapes execution in spindle turning (bead, V, cove, ...).
Darell Feltmate. This site is very interesting, full of tips and projects. To be visited on a regular basis, as it is often updated.
Alan Lacer's site. A master of the skew. No fancy gifs or colors on this site, but the articles section is worth visiting.
Forums
The Woodturner forum in english. A goldmine to find information about a special wood (worth turning or not for example), or debate about finishing or drying techniques. Look into the archives.
Another forum, Woodcentral. (look in the turning messageboard). 100% turning