One nice feature of Jitouch2 is that you can assign gestures to work in all apps or only specific apps. By assigning a gesture to a single app, you free it up to be used for something else in another app or keeps that gesture from doing something undesired in another app.
With so many possible gestures, it can quickly become overwhelming, like trying to remember too many keyboard shortcuts.
I suggest focusing on just a couple that you will use often.
For myself, I chose a three-finger tap to open a link in a new tab in Safari and a three-finger swipe up to go back to the previous app. That's enough for me to remember for now.
I see two small issues with Jitouch2 that you need to be aware of. First, the Jitouch2's gestures seem to be a bit fussier than the ones built in to Mac OS X. One rare occasions, a gesture didn't perform its action on the first try. The other issue is that, from reading the Jitouch2's website, it appears that Jitouch2 can break after even small updates to Mac OS X.. It does appear, however, that the developer is on top of problems that arise and fixes them quickly.
Jitouch2 can be found here and costs $7 with an extended trial period so you can test it out for yourself.