This (previous post) is a hack to get Vertical swiping back on the Magic Trackpad and doesn’t work for a laptop trackpad. For this fact I think Apple’s intention is to use the Option key as a modifier to activate vertical swiping and it is likely this hack will be fixed at some point.

So my suggestion to get swiping back in your favorite cell-based apps like Carousel, Reeder, Twitter, etc is:

Left/Right Swiping

This will give you 3-finger left/right swiping like you were used to in SL (and maintain the nifty 2-finger peak-at-your-previous-page in Safari)

Up/Down Swiping

Up/down swiping will activate when Option is held down and when the Mission Control/App Expose gesture is performed. So pick which one you like the best, 3 or 4 finger. Not ideal if you are used to the way it was in SL, but like reverse scrolling, you’ll be OK.