Well, according to their new lineup of shows... (
http://www.g4techtv.com/faq.html)
They are keeping The Screen Savers which makes me happy but they are killing Call for Help and Tech Live which makes me sad.
Not ever having watched G4 I don't know about any of their shows. However, with show names like "Cheat" "Filter" and "Sweat" I really don't know what to think since they sound so cheesy.