I have found this site, hosted by USC, to be useful. I first found it while looking for an interpretation of surah 9 of the Qur’an. The site has searchable english interpretations of the major Muslim texts done by three different Muslim scholars and presented together for comparison. By comparing all three interpretations one can hopefully gain a more accurate understanding of the underlying text.
I also find that the site is presented from the point of view of the faithful and proper Muslim, so it avoids some of the distortions associated with interpretations done by Islams critics.
If you wish to know what your enemy thinks, it is better to have him explain it than to have your ally do so.