Couldn't you just use an existing anagram server and parse the resulting page?:
http://www.ssynth.co.uk/~gay/cgi-bin/nph-an?line=fawlty+towers&words=3&dict=antworth
http://wordsmith.org/anagram/anagram.cgi?anagram=fawlty+towers&language=english&d=3&include=&exclude=&n=3&m=&source=adv&a=n&l=n&q=n
http://www.ssynth.co.uk/~gay/cgi-bin/nph-an?line=fawlty+towers&words=3&dict=antworth
http://wordsmith.org/anagram/anagram.cgi?anagram=fawlty+towers&language=english&d=3&include=&exclude=&n=3&m=&source=adv&a=n&l=n&q=n