Io 
Small, embeddable, object-oriented, prototype-based, garbage collected language; faster than Perl, Python, Ruby; supports actors and futures for concurrency. Influences: Smalltalk; Act1, Self, NewtonScript; Lisp; Lua. Descriptions, documents, download, mail list. [Open Source, BSD]
http://www.iolanguage.com/Steve Dekorte 
Io author site: links (several types including programming), projects, resume, weblog.
http://www.dekorte.com/
IoLanguage 
Wiki by Sebastien Pierre. Tips, news, projects.
http://wiki.type-z.org/index.php/Io/IoLanguage
Io Programming Language 
Growing article, with links to many related topics. [Wikipedia]
http://en.wikipedia.org/wiki/Io_programming_language
Io Notes 
Notes on some features and aspects of Io language.
http://iota.flowsnake.org/
Io Language for StepTalk on Cocoa 
Io bundle for StepTalk; works on Cocoa only because IoObjcBridge works on Cocoa only.
http://article.gmane.org/gmane.comp.lib.gnustep.general/26371/
Blame it on Io! A Slow-paced Introduction to the Io Language 
Brief Io totorial, part one. [Ozone, Weblog Archive]
http://ozone.wordpress.com/2006/03/15/blame-it-on-io/
Yahoo Groups: iolanguage 
Mail list and forum for Io language.
http://tech.groups.yahoo.com/group/iolanguage/