Right now, there are a handful of Google Wave gadgets designed to help you bring information from other sites into a wave and interact with that content collaboratively. It will be a wonderful day when every website can be wave-ified inside a Google Wave gadget, but until then, I want to share a simple method for embedding arbitrary webpages inside a wave- a new third party extension called the Iframe Gadget. When you insert this gadget, you (and anyone else in the wave) can specify the URL of a webpage, and the gadget will render that site right inside the wave. It works best with webpages that provide an embed code, like Google Maps, and fill all the available screen space. For example, let's say you want to embed your team's calendar on a wave. First, follow the instructions in the Google Calendar Help Center to find the Iframe code for embedding the calendar. Then, copy the URL out of that code and specify it in the Iframe gadget. Presto, calendar-o!…