String aList = "some,thing,else";
String bad = "thing";
String aNewList = "";
bool new = true;

StringTokenizer st = new StringTokenizer(aList, ",");

while(String s = st.nextToken()) {
	if(!s.equals(bad))
	{
		if(!new)
			aNewList += ",";
		aNewList += s;
	}
}