I would welcome it if you integrated a function to sort the songs in a playlist by date.

Thanks

What date?

I mean the date of building, so that you have the newest files at the end of a playlist for example.
A numeration of all songs in playlist would be nice, too. Otherwise I don´t know how many files there are in a playlist. Or do these functions already exist?

The number of files in the playlist is displayed at the bottom of the amaroK window, along with the total length of the playlist in hh:mm:ss

yeah, LE\'s right - amaroK\'ll display playlist track total and total length, if you have the status bar turned on. if not, you can find the checkbox to enable it in Settings->Configure amaroK->General.

as far as date, there is a \"year\" column you can add to the columns in the playlist display... which you could then sort by...

You can even define your own new column (at least in CVS_HEAD). Looks easy (nice work BTW, have not noticed this feature yet).
Right click on the column head and there it is. Try it!