Here’s a brief list of what I’ve found comparing some of the most popular multi-protocol IM clients. I’ll try to update this here and there when I have time!
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Windows |
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Linux |
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iPhone |
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Mac OS |

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Web Interface |

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Web Widget |

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One login for all accounts
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Tabbed Chat Windows |
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not for
iPhone app
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Video |

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Tokbox |

Some
work needed
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Only
for gTalk
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VOIP |
With
Plugin
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Tokbox
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Some
work needed
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(pay only for
calls to landlines)
Works Even
with iPhone app!
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Only
for gTalk
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Merge Contacts |

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Facebook |

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LinkedIn |

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MySpace |

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AIM / Yahoo! / MSN / XMPP |
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Supports,
No Support,
Web client may be used,
Must pay for feature
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