By now, if this girl were a runaway someone would have said something. She can't have acted totally alone and be hiding out without food, money, clothes, etc. all by herself somewhere. (Wilbanks was in her own country, took some money, knew where she was going, etc.) I doubt Natalee would be able to be resourceful enough in a strange place. Also, if someone had helped her get away, they would have talked by now, because the pressure is just too great. No one would cover up for a girl who had only been on the island such a short time and was unknown to anyone except a few fellows. No one would put themselves in that kind of jeopardy.
Sorry, IMHO the Runaway theory just does not "compute," but there are so many others FReepers have come up with that are possibilities. Who knows?
From: http://www.riehlworldview.com/carnivorous_conservative/
Update: Someone is hosting a great many news videos of reports in the Holloway case. Presently, the next to last appears to be CNN reporting on Paulus v d Sloot's now infamous scoot away from reporters.
http://nataleeholloway.tripod.com/
I'm very afraid that it may turn out to be an accidental death that have all involved trying desperately to figure out ways to not become directly implicated. That said, I still hope she is alive -- somewhere.