I think this is very lame and unlike Apple, to release an OS upgrade that makes so many programs incompatible. What the h*ll were they thinking? And there's no mention of this in their oh-so-glorious description of how wonderful their new OS is. And considering that this is mostly "under the hood" upgrades and they make a clear statement by making it available for $29, I think it's even more embarrassing that Apple, who are attacking Windows at each opportunity they get, do something like this. Microsoft(except for Vista maybe) never created this many incompatibility issues in a new iteration of their OS.
I ordered Snow Leopard and am gonna install it right away, because I read that Logic 9 will work perfectly normal on it (I gotta make sure my sound card + DSP card works too, though...), but if I was a user of those fairly new programs that now stops working I would be a bit pissed that Apple didn't warn me in any way.