In the November 30th 1UP Yours podcast, hosts Garnett Lee, Shane Bettenhausen and John Davison report that they have received the retail version of The Orange Box for PS3. Here are selected quotes from the segment, which begins at around 1:08:36 into the podcast.
"They did overcome a significant number of the frame-rate problems with the code they sent us prior to that."
"They fixed some shit."
"But not all of them."
"They got rid of the really janky parts."
"It just feels like it's just a hair out of sync because it's not quite running smooth. That's that way it is in some of the areas."
"It's slightly, perceptively, not quite as smooth as the 360 version."
"If you own both, you should do 360. But if you have PS3, there's absolutely no reason that you shouldn't get this. It's still too good an experience not play it."
[ Notes: The source link downloads the relevant MP3 segment, whose length is 1 minute and 30 seconds. ]