(Hmm; do I wait for the Debian package, or download and compile my own Gaim, taking charge of that package? I'll wait. A funny thing happens when a vendor shows the will to lock people out (as Yahoo have done before); people stop relying on them and move to other systems. At the moment, I don't expect Yahoo IM to work and generally don't bother with it. Though some of the other features, like MSN file transfers and user-icon dragging, look good.)
Speaking of MSN, it's reassuring that Microsoft haven't made good on the vague noises they made some time ago about locking unapproved clients out of their network. Perhaps they've realised that that would encourage people to move to other systems (read: AIM/ICQ); or perhaps they just haven't gotten around to it.