BetterTouchTool - Preserve Three Finger Drag And Keep UI Consistent With Trackpad
Choose "Swipe with two or three fingers" instead and you get the animations in Safari plus navigation everywhere else.
I was using this method to work around the loss of normal back and forward commands in Finder, Firefox, etc. with the default settings (which is crazy!). There are still two issues in my opinion:
1. You lose the ability to use Three Finger Drag (which I really like!)
2. When going back and forth in Finder, Firefox, etc. using a three finger swipe it's the exact opposite of the way Safari behaves when swiping with two fingers using an Apple Trackpad (ie. it does not mimic flipping a page in a book with three fingers... It's reversed). Although I'm loving Lion, it boggles my mind that Apple let this inconsistency slide... I for one have no problem adapting to natural scrolling and the new method of going back and forth in Safari, but at least keep it consistent throughout the UI! I'm sure things will fall in line eventually, but in the meantime...
Here is what I did to preserve three finger drag as well as use two finger swiping instead of three finger swiping in Finder, Firefox, etc. while keeping them consistent with Safari's cool new page flipping feature (which still works and shows the cool animation

).
Go into your Trackpad settings - Point & Click and enable Three Finger Drag. Then go into More Gestures and make sure Swipe between pages is set to Scroll left or right with two fingers (not two or three fingers - this will disable Three finger drag).
Install BetterTouchTool from:
http://blog.boastr.net/
After starting the software, go ahead and click on the icon in the upper right hand corner of the screen and tell it to Check for regular updates. This will get you up the latest stable version.
Go into BetterTouchTool preferences and add two new gestures:
Two Finger Swipe Left - Predefined Action: 3F Swipe Right (Page Forward)
Two Finger Swipe Right - Predefined Action: 3F Swipe Left (Page Forward)
Note: You can reverse these if you want the more traditional back and forward, but I chose to keep it consistent with Safari. Also, BetterTouchTool will complain when you are setting these gestures up that they may not work with Lion correctly. So far however, I have not experienced any issues.
After a lot of trial and error, this was the only way I was able to get everything to work (in my opinion) correctly. I'm sure I'm not the only one this behavior has bothered. Hopefully this helps some folks out!
Frank