If i can give my few cents here...We use several methods.
* For stationary groups on computers we use iChat via bonjour so you don't need an internet connection.
* For people moving around we use talkabouts (from costco, 1 pair is less than $50).
* For our tech crew that needs full duplex, we use clearcom. Clearcom is definitely pricey but it's a very worthwhile investment. We scour ebay and craigslist for deals on used gear. Since the economy wasn't doing so well we got a lot of old gear from road companies that were going out of business or some people who were upgrading their gear.
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