This seems a lot more webmaster / publisher-oriented, while Kongregate seems more (new) developer- and community-oriented. Just compare the Kongregate "About Us" page with HeyZap's front page. Kongregate even has its "Shootorials" which honestly might be more about marketing the site as newcomer-friendly and less about seriously teaching people stuff.
To be honest, I much prefer Kongregate's slant, but that's because I'm much more interested in the developer end of things. However, HeyZap is just starting, so I'm not going to fault it for not having all the bells and whistles Kongregate does. There also might be serious value in the widget model (i.e. HeyZap is not a destination, like Kongregate is) that I'm completely blind to because I personally think that's dumb.
To be honest, I much prefer Kongregate's slant, but that's because I'm much more interested in the developer end of things. However, HeyZap is just starting, so I'm not going to fault it for not having all the bells and whistles Kongregate does. There also might be serious value in the widget model (i.e. HeyZap is not a destination, like Kongregate is) that I'm completely blind to because I personally think that's dumb.