To be honest (even though you have to pay a one time fee for it) I'm extremely partial to Mundu IM. Works brilliantly on my 6700, although I tend to use windows live messenger for msn more than mundu, but it works great for everything else 
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Sprint Affiliate Sr. Technology Specialist
Current Devices: Sprint HTC Hero (Advocate Phone), Sprint Touch Pro 2 (Personal)
Previous Devices: Sprint Touch Pro, Verizon VX6800, Sprint PPC-6800, Sprint BlackBerry 8330, Sprint Centro, Sprint PPC-6700, Alltel PPC-6700, XDA Orbit, Sprint Treo 700p
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