Chat & IM

Pixfeed
MOKA Code(Free)
Download
Pixfeed: A Free Mac Program for Chat and Instant Messaging
Message2net
Novamedia(Trial version)
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SMS and Phonebook Management Made Easy with Message2net
FunkeeStory
Funkeemonk(Trial version)
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FunkeeStory: Instant Message Backup for Your Treo
BitTorrent Bleep
BitTorrent(Free)
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BitTorrent Bleep: A Free Internet Program for Mac
Chax
Ksuther(Trial version)
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Chax: Pimp your iChat with this awesome plug-in
Tweetie
Atebits(Trial version)
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Excellent Twitter client exclusively for Mac
iModz
Imodz(Free)
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Customize your iChat status
Spyder
Michael Link(Trial version)
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Spyder: Social Network Browser
iSoftPhone
Call4mac(Trial version)
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An iPhone on your desktop today
Snak
Snak(Trial version)
Download
Snak: IRC client for professionals