Toscanini Online
Exellent site with lots of information.

Toscanini Discography Home Page
Web site by John Wilson.

Toscanini's London Career
Discussion of Toscanini's London Career from First Coast Opera.

Toscanini, The Recorded Legend, Classical Notes
Notes by Peter Gutmann.

Toscanini Essay from 'Music in the Mail'
Essay by Karl Glassman, NBC Symphony Tympanist 1937-54.

4 April 1943 concert
Mid-Fi QuickTime of Complete 4 April 1943 concert from classicalmusiccd.com.

The Art of Arturo Toscanini (in Japanese)
Web site by Mr. Sakamoto.

The following labels are actively releasing material.

RCA (BMG)
Testament
Guild
Music & Arts
Naxos
Disco Archivia

I have not yet purchased from Disco Archivia so I do not know the quality of their work.