Official Sites:

Mattel's Max Steel
Mattel's official Max Steel site.

Pages on RTM:

Max Named Top Action Figure of 2000
A press release from Mattel announcing that the Max Steel action figures were named the #1 action figure series introduced in 2000.

Mission Cards Pulled
A press release from Mattel announcing that certain "Urban Mission" cards were being removed from Max Steel toys due to the September 11, 2001 attacks.

Elsewhere on the Net:

Max Steel - Toy Fair 2001
Pictures from the Mattel showroom at the 2001 Toy Fair, showing some of the Max Steel toys due to come out in 2001.

Joe World - Online
A listing (with descriptions) of which Max Steel products are out in retail stores.

Max Steel Archive
A Max Steel archive from the "Keeping Ken" site

Maximum Steel Mailing List
A mailing list for discussing Max Steel action figures and toys, as well as the cartoon series.

Max Steel: the Official Site
Sony Entertainment's official site for the tv series.

Pazsaz Entertainment
Pazsaz is the company that does the tv show for Sony - this page lists the voice cast and episode titles.