The HC9000D is pretty typical in terms of inputs and other connectors. One thing you won't find on a lot of projectors, is a DIN connector for a 3D sync emitter, which does come with the HC9000D.
There are the usual two HDMI inputs, an analog computer input, (that can alternately do component video instead). Then there's three color coded RCA jacks for a component video input, and of coursethe usual S-video, and composite video. Rounding things out are two 12 volt triggers, RS232 (for command and control), the previously mentioned 3D Sync connector, and the power receptacle.
It's very nice to see the optional screw receptacle for the HDMI connectors. This allow you to use cables that will also screw in, releaving a lot of the strain on the cable's connector. This should be a pretty standard feature for projectors, but isn't.