MSN has made web-based version of their Messenger IM client available as a public beta. The interface requires you to allow popups for the site (it actually complains about this if your browser is set to block popups), because it launches a seperate browser window that looks more or less like the regular MSN Messenger client:
You’ll notice that’s is running in Mozilla Firefox 0.9 (my main browser), so there’s no proprietary IE dependency, no ActiveX controls to install, etc.
I’m always signed in to MSN Messenger on my Smartphone, but this is a nice way to access your IM if you’re not on your own computer, or don’t otherwise have MSN Messenger installed.
Give it a try, and post what you think!