I know this thread is burried since two months, but I'm really missing Sib from the N900 too. As we already have Mplayer working on the N9, and considering the similarities between Maemo 5 and Harmattan, would it be possible to port it? I really have difficulties in using only KMplayer, that GUI is definitely not for me. :/

Actually Sib would not be ideal without hardware keyboard. What about another GUI like SMplayer (there was a version for N900 also if I remember correctly)?