I've been using .37 for a couple of weeks now. I haven't really noticed any major performance/responsiveness improvements. I immediately looked for the rest of the desktop responsiveness stuff that partially made it into .36. I've also been compiling without BKL, but nothing feels too different. (My webcam -- v4l -- still works though so maybe I did something wrong). I'm using a AMD Phenom II X4 965 though, so maybe I need to test on a slower computer.
On the downside I still have problems with r8169 after suspends/resumes and reboots. Also, still have problems with the screen coming back after resume (radeon) - need to play around with ctrl+alt+f1 -> ctrl+alt+f7 to get it back. Sometimes it doesn't come back at all (mouse/keyboard lights are also dead in this case).
I was also hoping to see some refinement of vgaswitcheroo, but still have problems when the other card is powered off, and with the backlights.