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Trading Room Software/Platforms

Inspired by a comment made by another trader I've started this topic to discuss various ways that traders can interact with each other.

One of my favorites is Skype ( It's VOIP and has the best quality of any VOIP so far.

I know that other traders get together using Yahoo Messenenger and PalTalk. What else is out there?
hotcomm: voice & desktop / chart sharing

trade maven: real-time chart sharing, alerts & chat