Pretty Sure they are using Livestream Producer or Adobe Flash Encoder or a combo of both. (There is also an Apple streamer you can use as well)
And from observing the stream...
Shure SM-58 Mics with Mic Flags
Blue Blueberry Mic
I know at one point Pete had a Presonus Mixer, not sure what they upgraded too.
They also have a compressor in-line to remove dynamic range and prevent clipping of audio.
various consumer/pro-sumer video cameras for in studio and Nikon DSLR's (except Corey who is faithful to Canon) for video from the parks. Park bench video is probably captured with a camcorder because of DSLR limitations on length of recording.
I am sure Dustin, Shaun, and Craig can give a much better list than I can.