I've called tech support about this and another problem. You get 90 days free support after buying Lion. So, if your machine is past the warranty period, you're still covered for Lion.
The first person I talked to tried several trouble-shooting techniques to get my monitor to sleep upon closing the lid. (It would only sleep via choosing "sleep" via the Apple symbol). After several failed attempts to fix this problem, I was passed to a Senior Advisor.
The Senior Advisor and I tried several things, ranging from resetting various things (pushing several keys) while turning the MBP off -- and also pushing several keys during startup. Each attempt was to clear or reset the MBP in one form or another. We even tried creating a new user, etc. Eventually, he e-mailed me a "Capture Data" file which permits Apple to take a snapshot of my error messages, etc. (Keep in mind, just 1 day ago the Genius Bar gave me a new logic board and they ran "deep diagnostics" on it before I took it home. I wasn't having this problem before getting the new logic board. But, the Genius bar "cleared" my MBP via "deep diagnostics" and sent it home with me. If it weren't for others having this problem, I would have thought it was a faulty logic board or a bad installation of the logic board). I then e-mailed the Senior Advisor (while still talking to him on the phone) that "Capture Data" report. I should hear back from some techie guru department within a week. Who knows, maybe the issue is with a certain logic board and that's why not everyone has this problem???
Concerning the "memory leakage" with Safari (my 2nd big problem), the Senior Advisor had me delete ALL of my extensions in Safari (by going to my library and deleting my internet plugins from that specific folder. (Keep in mind, Apple hides your USER library now and you have to press "alt" and click "go" when you're at your home folder in Finder. I need to monitor Safari and, if really necessary, re-install extensions 1 by 1 if I really need them (as such sites might).
So, if you're having it, CALL Apple so that they know about it. They can't fix something if they don't know is broken. And, everyone's Mac is configured differently (and with different hardware). They have to do research to find out where the problem is coming from. It may be a Lion problem with a particular Mac, configuration, etc. They can't get that information via reading MacRumors threads.