Shortly, about the new features in v.3.1.0. The two most important things are: 1) Filtering of the call / message log by type and 2) Selection of the accounts in use.
By filtering the calls and messages by type (you can select what the log should show) it’s really easy to get a clearer overview of, for example, all the missed calls you have. This was a requested feature, and it’s quite useful.
The second feature was also requested, even from the earliest versions of the app, and was even implemented once, but since the account management was introduced in Android 2.1, the solution I came up with for earlier versions of Android didn’t function well on all devices. This time, the feature is implemented only for Android 2.1 and above devices, so everything is “by the book”.