I personally like fring the best. It covers all including the rare Skype.
First, I'm cheap, so I stick with the free ones.
Secondly I hate ugly UI's so that takes out Slick and IMOV.
Octro is cool, but it adds unnecesary crap on my PC Google Talk contacts.
Palringo is cool, but it limits you to one open IM chat window.
fring
Free
www.fring.com
Skype, MSN Messenger, Google Talk, ICQ, SIP, Twitter, Yahoo! and AIM
OctroTalk
Free
http://www.octrotalk.com/
Google Talk/Jabber, MSN, AIM, ICQ, Yahoo
Palringo
Free
http://www.palringo.com/
Windows Live Messenger, Yahoo!, Aim, Gadu-Gadu AOL ICQ Google Talk, Jabber
Slick
Free
http://www.lonelycatgames.com/?app=slick
ICQ, Yahoo, AIM, MSN, Google Talk, Jabber
IMOV Messenger
Free
http://www.movsoftware.com/products/imov/imov.htm
Google Talk, AOL, ICQ, MSN, Yahoo! Messenger, Jabber
Mundu IM
$11
http://messenger.mundu.com/
AIM, MSN, Yahoo, Google Talk.
IM+
$39.95
http://www.shapeservices.com/en/prod...tform=pocketpc
AIM/iChat, MSN/Windows Live Messenger, Yahoo!, ICQ, Jabber, Google Talk, MySpace
Agile Messenger 3
$44.95
http://www.agilemobile.com/
MSN , AIM , Yahoo! , ICQ & GoogleTalk
Causerie
$19.99
http://causerie.mantragroup.com/prod...pocketpcim.php
Yahoo, MSN, AIM, ICQ, Jabber, Google Talk
Mobile IM
$34.95/yr
http://www.webmessenger.com/products/mimpocketpc.htm
AOL, MSN, Yahoo, Google Talk, ICQ and Jabber