A few tips which can make tracking time with Eternity Time Log easier and faster on your iPhone and iPad.
Going to the top of Activities hierarchy
When running timers, sometimes you may find yourself deep in the activities hierarchy and you’d like to go to the top. You can go there quickly by tapping on the “Activities” tab (on iPhone) or the “All” switch (on iPad) at the bottom of the screen.
You may also find it working similarly in other apps on the iPhone, when a tab is showing hierarchical data (TabBar with NavigationController as developers would call it). The segmented switch on the iPad, though, has been customized in Eternity to reflect the iPhone’s version behavior and you probably can’t depend on it in other apps.
Switching between Logs Table and TouchLog modes
As you probably know Eternity has two modes for logs preview and editing: standard table – every row is an entry; and TouchLog – zoomable, calendar-like. You can switch between them by tapping on an icon in the top-left-corner of the Logs view. But you can also tap on the Logs tab (on iPhone) or the Logs switch (on iPad) and it will take you to the Table or TouchLog mode as well. These places are at the bottom of the screen, so they are much easier to reach with your thumbs, especially on iPad.
Using swipe gesture on Logs, TouchLog and Reports
Besides the arrows on the top, you can use swipe gestures on Logs, TouchLog and Reports to shift the reported interval. Just swipe left or right to go to a later or earlier interval. Again, this may be especially useful on iPad where the bigger screen makes it harder to reach and tap controls precisely. Logs, TouchLog and Reports views present content which is scrollable up and down so swiping left and right may require some precision too, but please try it and decide what works better for you: arrows or swipes.
I hope these two tips will save you some time and maybe even frustration in everyday operation of Eternity 
Update: Going to the top of Activities and Logs/TouchLog switching by tapping on the segment control doesn’t seem to work in iOS 5.0. I’ll try to fix it in the next version. Fixed in 2.1!