Feel free to enter here the bugs you just found.
Diff algorithm
Very simple, needs a lot of improvement as it is far from only showing minimal differences.
Cutting long link names
Wiclear cuts long link names at character 40. There is no way to customize this value. There is no way to disable cutting. Current implementation can not cut UTF-8 encoded strings correctly (it can possibly cut at the middle of the character).
David : This should be fixed. Can you confirm it ? This is now "configurable" in the constants.lib.php file