I've just posted a pre-release of aMSN Portable. This is another one I'd had kicking around. It's an instant messaging client specific to MSN. As a result, it can use some of the more advanced features of MSN that Gaim and Miranda can't.
Download aMSN Portable 0.97 RC1 Pre-Release 2
(may take a few minutes to hit the download servers)
Please give it a try and post your feedback.
UPDATE (July 19) Pre-Release 2: Fixed DefaultData, added in default of logs being off.